Sexual orientation describes an enduring pattern of attraction—emotional, romantic, sexual, or some combination of these—to the opposite sex, the same sex, both, or neither, and the genders that accompany them. By the convention of organized researchers, these attractions are subsumed under heterosexuality, homosexuality, bisexuality, and asexuality. According to the American Psychological Association, sexual orientation also refers to a person's sense of "personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them."[1][2]
The term sexual preference largely overlaps with sexual orientation, but is distinguished in psychological research.[3] A person who identifies as bisexual, for example, may sexually prefer one sex over the other.[4] "Sexual preference" may also suggest a degree of voluntary choice, which is disputed in terms of sexual formation,[3] as current consensus among scholars is that sexual orientation is not a choice.[5][6][7]
No simple, single cause for sexual orientation has been conclusively demonstrated, but research suggests that it is by a combination of genetic, hormonal, and environmental influences,[8] with biological factors involving a complex interplay of genetic factors and the early uterine environment.[9] Research over several decades has demonstrated that sexual orientation ranges along a continuum, from exclusive attraction to the opposite sex to exclusive attraction to the same sex. It is usually discussed in terms of heterosexuality, bisexuality and homosexuality,[1] though asexuality is increasingly recognized as a fourth category.[10][11][12] These categories are aspects of the more nuanced nature of sexual identity. For example, people may use other labels or none at all.[1]
While sexual orientation is reported in this article primarily within biology and psychology, including sexology, for reports within anthropology and history, including social constructionism, see the section on other explanations.
Most definitions of sexual orientation include a psychological component, such as the direction of an individual's erotic desire, or a behavioral component, which focuses on the sex of the individual's sexual partner/s. Some people prefer simply to follow an individual's self-definition or identity.
The American Psychological Association states that "[s]exual orientation is an enduring emotional, romantic, sexual, or affectional attraction toward others. It is easily distinguished from other components of sexuality including biological sex, gender identity (the psychological sense of being male or female), and the social gender role (adherence to cultural norms for feminine and masculine behavior). Sexual orientation exists along a continuum that ranges from exclusive heterosexuality to exclusive homosexuality and includes various forms of bisexuality. Bisexual persons can experience sexual, emotional, and affectional attraction to both their own sex and the opposite sex. Persons with a homosexual orientation are sometimes referred to as gay (both men and women) or as lesbian (women only). Sexual orientation is different from sexual behavior because it refers to feelings and self-concept. Individuals may or may not express their sexual orientation in their behaviors."[13]
Sexual identity and sexual behavior are closely related to sexual orientation, but they are distinguished, with identity referring to an individual's conception of themselves, behavior referring to actual sexual acts performed by the individual, and orientation referring to "fantasies, attachments and longings."[14] Individuals may or may not express their sexual orientation in their behaviors.[15] People who have a homosexual sexual orientation that does not align with their sexual identity are sometimes referred to as 'closeted'.[16] The term may, however, reflect a certain cultural context and particular stage of transition in societies which are gradually dealing with integrating sexual minorities. In studies related to sexual orientation, when dealing with the degree to which a person's sexual attractions, behaviors and identity match, scientists usually use the terms concordance or discordance.[17] Thus, a woman who is attracted to other women, but calls herself heterosexual and only has sexual relations with men, can be said to experience discordance between her sexual orientation (homosexual or lesbian) and her sexual identity and behaviors (heterosexual).
Sexual identity may also be used to describe a person's perception of his or her own sex, rather than sexual orientation. The term sexual preference has a similar meaning to sexual orientation, but it may be incorrectly interpreted as endorsing the notion that sexual orientation is, in whole or part, a matter of choice.[3]
Sexual orientation traditionally was defined as including heterosexuality, bisexuality, and homosexuality. Asexuality is now considered a sexual orientation by some researchers and has been defined as the absence of a traditional sexual orientation. An asexual has little to no sexual attraction to males or females.[10][11][12]
Androphilia and gynephilia (or gynecophilia) are terms used in behavioral science to describe sexual attraction, as an alternative to a homosexual and heterosexual conceptualization. They are used for identifying a subject's object of attraction without attributing a sex assignment or gender identity to the subject. Related terms like bisexual and pansexual do not make any assignations to the subject. Using androphilia and gynephilia can avoid confusion and offense when describing people in non-western cultures, as well as when describing intersex and transgender people.
Psychiatrist Anil Aggrawal explains that androphilia, along with gynephilia, "is needed to overcome immense difficulties in characterizing the sexual orientation of transmen and transwomen. For instance, it is difficult to decide whether a transman erotically attracted to males is a heterosexual female or a homosexual male; or a transwoman erotically attracted to females is a heterosexual male or a lesbian female. Any attempt to classify them may not only cause confusion but arouse offense among the affected subjects. In such cases, while defining sexual attraction, it is best to focus on the object of their attraction rather than on the sex or gender of the subject."[18] Sexologist Milton Diamond writes, "The terms heterosexual, homosexual, and bisexual are better used as adjectives, not nouns, and are better applied to behaviors, not people. This usage is particularly advantageous when discussing the partners of transsexual or intersexed individuals. These newer terms also do not carry the social weight of the former ones."[19]
Some researchers advocate use of the terminology to avoid bias inherent in Western conceptualizations of human sexuality. Writing about the Samoan fa'afafine demographic, sociologist Johanna Schmidt writes that in cultures where a third gender is recognized, a term like "homosexual transsexual" does not align with cultural categories.[20]
Other researchers, such as Bruce Bagemihl, have criticized the labels "androphilia" and "gynephilia/gynecophilia" as confusing and degrading. Bagemihl writes, "...the point of reference for 'heterosexual' or 'homosexual' orientation in this nomenclature is solely the individual's genetic sex prior to reassignment (see for example, Blanchard et al. 1987[24], Coleman and Bockting, 1988[25], Blanchard, 1989[26]). These labels thereby ignore the individual’s personal sense of gender identity taking precedence over biological sex, rather than the other way around."[21] Bagemihl goes on to take issue with the way this terminology makes it easy to claim transsexuals are really homosexual males seeking to escape from stigma.[21]
The earliest writers on sexual orientation usually understood it to be intrinsically linked to the subject's own sex. For example, it was thought that a typical female-bodied person who is attracted to female-bodied persons would have masculine attributes, and vice versa.[22] This understanding was shared by most of the significant theorists of sexual orientation from the mid nineteenth to early twentieth century, such as Karl Heinrich Ulrichs, Richard von Krafft-Ebing, Magnus Hirschfeld, Havelock Ellis, Carl Jung, and Sigmund Freud, as well as many gender-variant homosexual people themselves. However, this understanding of homosexuality as sexual inversion was disputed at the time, and, through the second half of the twentieth century, gender identity came to be increasingly seen as a phenomenon distinct from sexual orientation. Transgender and cisgender people may be attracted to men, women, or both, although the prevalence of different sexual orientations is quite different in these two populations (see sexual orientation of transwomen). An individual homosexual, heterosexual or bisexual person may be masculine, feminine, or androgynous, and in addition, many members and supporters of lesbian and gay communities now see the "gender-conforming heterosexual" and the "gender-nonconforming homosexual" as negative stereotypes. However, studies by J. Michael Bailey and KJ Zucker have found that a majority of gay men and lesbians report being gender-nonconforming during their childhood years.[23]
The majority of transgender people today identify with the sexual orientation that corresponds with their gender; meaning that a transwoman who is solely attracted to women would often identify as a lesbian. Female-attracted transmen often consider themselves straight men, yet some participate in the lesbian community.
Sexual orientation sees greater intricacy when non-binary understandings of both sex (male, female, or intersex) and gender (man, woman, transgender, third gender, or gender variant) are considered. Sociologist Paula Rodriguez Rust (2000) argues for a more multifaceted definition of sexual orientation:
...Most alternative models of sexuality... define sexual orientation in terms of dichotomous biological sex or gender... Most theorists would not eliminate the reference to sex or gender, but instead advocate incorporating more complex nonbinary concepts of sex or gender, more complex relationships between sex, gender, and sexuality, and/or additional nongendered dimensions into models of sexuality.
— Paula C. Rodriguez Rust[24]
Gay and lesbian people can have sexual relationships with someone of the opposite sex for a variety of reasons, including the desire for family with children and concerns of discrimination and religious ostracism.[25][26][27][28][29]
While some GLBT people hide their respective orientations from their spouses, others develop positive gay and lesbian identities while maintaining successful marriages.[30][31][32] Coming out of the closet to oneself, a spouse of the opposite sex, and children can present challenges that are not faced by gay and lesbian people who are not married to people of the opposite sex or do not have children.
The American Psychiatric Association (APA) has stated, "some people believe that sexual orientation is innate and fixed; however, sexual orientation develops across a person's lifetime".[33] The APA also says that "most people experience little or no sense of choice about their sexual orientation".[34] "[F]or some ["people"] the focus of sexual interest will shift at various points through the life span..."[35] A community may change over time.[36] In a joint statement with other major American medical, psychology, educator, and religious organizations, the APA says that "different people realize at different points in their lives that they are heterosexual, gay, lesbian, or bisexual".[37] A report from the Centre for Addiction and Mental Health states, "For some people, sexual orientation is continuous and fixed throughout their lives. For others, sexual orientation may be fluid and change over time".[38] "There . . . [was, as of 1995,] essentially no research on the longitudinal stability of sexual orientation over the adult life span. . . . [I]t [was] . . . still an unanswered question whether . . . [the] measure [of "the complex components of sexual orientation as differentiated from other aspects of sexual identity at one point in time"] will predict future behavior or orientation. Certainly, it [was] . . . not a good predictor of past behavior and self-identity, given the developmental process common to most gay men and lesbians (i.e., denial of homosexual interests and heterosexual experimentation prior to the coming-out process)."[39]
"[A number of] lesbian women, and some heterosexual women as well, perceive choice as an important element in their sexual orientations."[40]
Innate bisexuality, or predisposition to bisexuality, is an idea introduced by Sigmund Freud, based on work by his associate Wilhelm Fliess. According to this theory, all humans are born bisexual but through psychological development, which includes both external and internal factors, become monosexual while the bisexuality remains in a latent state.
No major mental health professional organization has sanctioned efforts to change sexual orientation and virtually all of them have adopted policy statements cautioning the profession and the public about treatments that purport to change sexual orientation. These include the American Psychiatric Association, American Psychological Association, American Counseling Association, National Association of Social Workers in the USA,[2][41] the Royal College of Psychiatrists,[42] and the Australian Psychological Society.[43] According to the American Psychological Association and the Royal College of Psychiatrists' Gay and Lesbian Mental Health Special Interest Group, there is no sound scientific evidence that sexual orientation can be changed.[42][44]
In 2009 the American Psychological Association Task Force on Appropriate Therapeutic Responses to Sexual Orientation conducted a systematic review of the peer-reviewed journal literature on sexual orientation change efforts (SOCE) and concluded:
Efforts to change sexual orientation are unlikely to be successful and involve some risk of harm, contrary to the claims of SOCE practitioners and advocates. Even though the research and clinical literature demonstrate that same-sex sexual and romantic attractions, feelings, and behaviors are normal and positive variations of human sexuality, regardless of sexual orientation identity, the task force concluded that the population that undergoes SOCE tends to have strongly conservative religious views that lead them to seek to change their sexual orientation. Thus, the appropriate application of affirmative therapeutic interventions for those who seek SOCE involves therapist acceptance, support, and understanding of clients and the facilitation of clients' active coping, social support, and identity exploration and development, without imposing a specific sexual orientation identity outcome.[45]
NARTH, which describes itself as a "professional, scientific organization that offers hope to those who struggle with unwanted homosexuality," disagrees with the mainstream mental health community's position on conversion therapy.[46][47][48][49] The American Psychological Association and the Royal College of Psychiatrists expressed concerns that the positions espoused by NARTH are not supported by the science and create an environment in which prejudice and discrimination can flourish.[42][44]
Varying definitions and strong social norms about sexuality can make sexual orientation difficult to quantify.
From at least the late nineteenth century in Europe, there was speculation that the range of human sexual response looked more like a continuum than two or three discrete categories. Berlin sexologist Magnus Hirschfeld published a scheme in 1896 that measured the strength of an individual's sexual desire on two independent 10-point scales, A (homosexual) and B (heterosexual).[50] A heterosexual individual may be A0, B5; a homosexual individual may be A5, B0; an asexual would be A0, B0; and someone with an intense attraction to both sexes would be A9, B9.
Fifty years later, American sexologist Alfred Kinsey wrote in Sexual Behavior in the Human Male (1948):[51]
Males do not represent two discrete populations, heterosexual and homosexual. The world is not to be divided into sheep and goats. It is a fundamental of taxonomy that nature rarely deals with discrete categories... The living world is a continuum in each and every one of its aspects. While emphasizing the continuity of the gradations between exclusively heterosexual and exclusively homosexual histories, it has seemed desirable to develop some sort of classification which could be based on the relative amounts of heterosexual and homosexual experience or response in each history... An individual may be assigned a position on this scale, for each period in his life.... A seven-point scale comes nearer to showing the many gradations that actually exist.
The Kinsey scale measures sexual orientation from 0 (exclusively heterosexual) to 6 (exclusively homosexual), with an additional category, X, for those with no sexual attraction to either women or men. Unlike Hirschfeld's scale, the Kinsey scale is one-dimensional. Simon LeVay wrote, "it suggests (although Kinsey did not actually believe this) that every person has the same fixed endowment of sexual energy, which he or she then divides up between same-sex and opposite-sex attraction in a ratio indicative of his or her own sexual orientation."[52]
Means typically used include surveys, interviews, cross-cultural studies, physical arousal measurements[53] sexual behavior, sexual fantasy, or a pattern of erotic arousal.[54] The most common is verbal self-reporting[53] or self-labeling,[54] which depend on respondents being accurate about themselves.[53]
Research has identified several biological factors which may be related to the development of sexual orientation, including genes, prenatal hormones, and brain structure. No single controlling cause has been identified, and research is continuing in this area.[55]
The prevailing view is that sexual orientation is biological in nature, determined by a complex interplay of genetic factors and the early uterine environment. Sexual orientation is therefore not a choice. That is, individuals do not choose to be homosexual, heterosexual, bisexual, or asexual. There is no substantive evidence to support the suggestion that early childhood experiences, parenting, sexual abuse, or other adverse life events influence sexual orientation. However, studies do find that as aspects of sexuality expression have an experiential basis, parental attitudes towards a particular sexual orientation may affect how their children experiment with behaviours related to a certain orientation. [5][6][34][56][57]
Homosexuality was once thought to be the result of troubled family dynamics or faulty psychological development. Those assumptions are now understood to have been based on misinformation and prejudice . Current scientific investigation seeks to find biological explanations for the adoption of a particular sexual orientation. As yet there are no replicated scientific studies supporting any specific biological etiology for human sexual orientation.[58] although scientific studies have found a number of statistical biological differences between gay people and heterosexuals, which may result from the same underlying cause as sexual orientation itself.
Genes may be related to the development of sexual orientation. At one time, studies of twins appeared to point to a major genetic component, but problems in experimental design of the available studies have made their interpretation difficult, and one recent study appears to exclude genes as a major factor.[55]
The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the adult.
Fetal hormones may be seen as either the primary influence upon adult sexual orientation or as a co-factor interacting with genes or environmental and social conditions.[59]
A 2010 endocrinology study by Garcia-Falgueras and Swaab states that intrauterine exposure to hormones is largely the determinative criteria.[7]
Sexual orientation depends on the ability of one person to identify the sex of another. In humans, this is a learned mental process. In 2008, it was suggested that innate root cues and mechanisms determine the sexual orientation of the adult.[60] [61] These root cues and mechanisms process information that the child receives from the environment. They identify other sexual orientation cues that are embedded in the information flow, and internalize them in information structures. At puberty, sexual orientation emerges. Adults of the same sexual orientation share common root cues and mechanisms. Different root cues and mechanisms result in different orientations. Different life experiences cause personal variations within an orientation.
The innate cues satisfy universality conditions: they do not depend on race, ethnicity, culture, or historical period. Root cues that are transmitted by men are different from those transmitted by women. The brains of boys and girls process those cues using the same innate mechanisms. Boys and girls whose innate brains are tuned to root cues transmitted by men will be sexually attracted, at puberty, to men. Boys and girls whose innate brains are tuned to women’s root cues will be sexually attracted, at puberty, to women. The emerging sexual orientation at puberty depends on that actual innate tuning of the boy or the girl. That innate tuning may be genetic or due to sex hormones concentration in early developmental stages.
In humans, hearing is the only sense that satisfies the universality conditions. Both the vocal and auditory systems are genetically differentiated between the sexes. Voice is one of the most robust, reliable, universal cues which are used for identifying the sex of a person. In addition, the auditory system shows differentiation along sex and orientation lines.[62][63]
Currently, most of our knowledge about the underlying causes of sexual orientations is in the form of correlations between physiological features and sexual orientation. The auditory system provides not only correlations, but also feasible explanations of cause-effect relationships between system and mechanisms on one hand, and observed behaviors on the other. More studies are needed, though, to resolve the issue.
Studying human sexual arousal has proved a fruitful way of understanding how men and women differ as genders and in terms of sexual orientation. A clinical measurement may use penile or vaginal photoplethysmography, where genital engorgement with blood is measured in response to exposure to different erotic material.[54]
Some researchers who study sexual orientation argue that the concept may not apply similarly to men and women. A study of sexual arousal patterns[64] found that women, when viewing erotic films which show female-female, male-male and male-female sexual activity (oral sex or penetration), have patterns of arousal which do not match their declared sexual orientations as well as men's. That is, heterosexual and lesbian women's sexual arousal to erotic films do not differ significantly by the genders of the participants (male or female) or by the type of sexual activity (heterosexual or homosexual). On the contrary, men's sexual arousal patterns tend to be more in line with their stated orientations, with heterosexual men showing more penis arousal to female-female sexual activity and less arousal to female-male and male-male sexual stimuli, and homosexual and bisexual men being more aroused by films depicting male-male intercourse and less aroused by other stimuli.
Another study on men and women's patterns of sexual arousal confirmed[65] that men and women have different patterns of arousal, independent of their sexual orientations. The study found that women's genitals become aroused to both human and nonhuman stimuli from movies showing humans of both genders having sex (heterosexual and homosexual) and from videos showing non-human primates (bonobos) having sex. Men did not show any sexual arousal to non-human visual stimuli, their arousal patterns being in line with their specific sexual interest (women for heterosexual men and men for homosexual men).
These studies suggest that men and women are different in terms of sexual arousal patterns and that this is also reflected in how their genitals react to sexual stimuli of both genders or even to non-human stimuli. It must be stated that sexual orientation has many dimensions (attractions, behavior, identity), of which sexual arousal is the only product of sexual attractions which can be measured at present with some degree of physical precision. Thus, the fact that women are aroused by seeing non-human primates having sex does not mean that women's sexual orientation includes this type of sexual interest. Some researchers argue that women's sexual orientation depends less on their patterns of sexual arousal than men's and that other components of sexual orientation (like emotional attachment) must be taken into account when describing women's sexual orientations. In contrast, men's sexual orientations tend to be primarily focused on the physical component of attractions and, thus, their sexual feelings are more exclusively oriented according to sex.
More recently, scientists have started to focus on measuring changes in brain activity related to sexual arousal, by using brain-scanning techniques. Given that sexual feelings are the product of perceptions or fantasies which are processed in the brain, measuring brain regions' activity should further show how people of different sexual orientations differ in this respect.
A study on how heterosexual and homosexual men's brains react to seeing pictures of naked men and women has found[66] that both hetero- and homosexual men react positively to seeing their preferred sex, using the same brain regions. The only significant group difference between these orientations was found in the amygdala, a brain region known to be involved in regulating fear.[67]
Although these findings have contributed to understanding how sexual arousal can differentiate between genders and sexual orientations, it is still a matter of debate whether these results reflect differences which are the result of social learning or genetic or biological factors. Further studies are needed to clarify how much of people's reactions to sexual stimuli of their preferred gender are due to learned or innate factors.
The attempt to detect sexual orientation in social situations is known as gaydar; some studies have found that guesses based on face photos perform better than chance.
Recent studies found an increased chance of homosexuality in men whose mothers previously carried to term many male children. This effect is nullified if the man is left-handed.[68]
A legal brief dated September 26, 2007, and presented on behalf of the American Psychological Association, California Psychological Association, American Psychiatric Association, National Association of Social Workers, and National Association of Social Workers, California Chapter, stated:[69]
Currently, there is no scientific consensus about the specific factors that cause an individual to become heterosexual, homosexual, or bisexual — including possible biological, psychological, or social effects of the parents' sexual orientation.
And added in a footnote:[70]
Although much research has examined the possible genetic, hormonal, developmental, social, and cultural influences on sexual orientation, no findings have emerged that permit scientists to conclude that sexual orientation – heterosexuality, homosexuality, or bisexuality – is determined by any particular factor or factors. The evaluation of amici is that, although some of this research may be promising in facilitating greater understanding of the development of sexual orientation, it does not permit a conclusion based in sound science at the present time as to the cause or causes of sexual orientation, whether homosexual, bisexual, or heterosexual.
The American Psychological Association, the American Psychiatric Association, and the National Association of Social Workers in 2006 stated:[2]
Currently, there is no scientific consensus about the specific factors that cause an individual to become heterosexual, homosexual, or bisexual – including possible biological, psychological, or social effects of the parents' sexual orientation. However, the available evidence indicates that the vast majority of lesbian and gay adults were raised by heterosexual parents and the vast majority of children raised by lesbian and gay parents eventually grow up to be heterosexual.
The American Academy of Pediatrics in 2004 stated:[5]
The mechanisms for the development of a particular sexual orientation remain unclear, but the current literature and most scholars in the field state that one's sexual orientation is not a choice; that is, individuals do not choose to be homosexual or heterosexual. A variety of theories about the influences on sexual orientation have been proposed. Sexual orientation probably is not determined by any one factor but by a combination of genetic, hormonal, and environmental influences. In recent decades, biologically based theories have been favored by experts. Although there continues to be controversy and uncertainty as to the genesis of the variety of human sexual orientations, there is no scientific evidence that abnormal parenting, sexual abuse, or other adverse life events influence sexual orientation. Current knowledge suggests that sexual orientation is usually established during early childhood.
The Royal College of Psychiatrists in 2007 stated:[6]
Despite almost a century of psychoanalytic and psychological speculation, there is no substantive evidence to support the suggestion that the nature of parenting or early childhood experiences play any role in the formation of a person's fundamental heterosexual or homosexual orientation. It would appear that sexual orientation is biological in nature, determined by a complex interplay of genetic factors and the early uterine environment. Sexual orientation is therefore not a choice.
The American Psychiatric Association stated:[58]
No one knows what causes heterosexuality, homosexuality, or bisexuality. Homosexuality was once thought to be the result of troubled family dynamics or faulty psychological development. Those assumptions are now understood to have been based on misinformation and prejudice.
The multiple aspects of sexual orientation and the boundary-drawing problems already described create methodological challenges for the study of the demographics of sexual orientation. Determining the frequency of various sexual orientations in real-world populations is difficult and controversial.
Most modern scientific surveys find that the majority of people report a mostly heterosexual orientation. However, the relative percentage of the population that reports a homosexual orientation varies with differing methodologies and selection criteria. Most of these statistical findings are in the range of 2.8 to 9% of males, and 1 to 5% of females for the United States[71] – this figure can be as high as 12% for some large cities and as low as 1% for rural areas.
Estimates for the percentage of the population that are bisexual vary widely, at least in part due to differing definitions of bisexuality. Some studies only consider a person bisexual if they are nearly equally attracted to both sexes, and others consider a person bisexual if they are at all attracted to the same sex (for otherwise mostly heterosexual persons) or to the opposite sex (for otherwise mostly homosexual persons). A small percentage of people are not sexually attracted to anyone (asexuality).
In the oft-cited and oft-criticized Sexual Behavior in the Human Male (1948) and Sexual Behavior in the Human Female (1953), by Alfred C. Kinsey et al., people were asked to rate themselves on a scale from completely heterosexual to completely homosexual. Kinsey reported that when the individuals' behavior as well as their identity are analyzed, most people appeared to be at least somewhat bisexual — i.e., most people have some attraction to either sex, although usually one sex is preferred. According to Kinsey, only a minority (5–10%) can be considered fully heterosexual or homosexual. Conversely, only an even smaller minority can be considered fully bisexual (with an equal attraction to both sexes). Kinsey's methods have been criticized as flawed, particularly with regard to the randomness of his sample population, which included prison inmates, male prostitutes and those who willingly participated in discussion of previously taboo sexual topics. Nevertheless, Paul Gebhard, subsequent director of the Kinsey Institute for Sex Research, reexamined the data in the Kinsey Reports and concluded that removing the prison inmates and prostitutes barely affected the results.[72]
Because sexual orientation is complex and multi-dimensional, some academics and researchers, especially in Queer studies, have argued that it is a historical and social construction. In 1976, philosopher and historian Michel Foucault argued that homosexuality as an identity did not exist in the eighteenth century; that people instead spoke of "sodomy", which referred to sexual acts. Sodomy was a crime that was often ignored but sometimes punished severely (see sodomy law). He wrote, "'Sexuality' is an invention of the modern state, the industrial revolution, and capitalism."[73]
Sexual orientation is a concept that evolved in the industrialized West and there is a controversy as to the universality of its application in other societies or cultures.[74][75][76] Non-westernized concepts of male sexuality differ essentially from the way sexuality is seen and classified under the Western system of sexual orientation.[77] The validity of the notion of sexual orientation as defined in the West, as a biological phenomenon rather than a social construction specific to a region and period, has also been questioned within the industrialized Western society.[78][79]
Heterosexuality and homosexuality are terms often used in European and American cultures to encompass a person's entire social identity, which includes self and personality. In Western cultures, some people speak meaningfully of gay, lesbian, and bisexual identities and communities. In other cultures, homosexuality and heterosexual labels do not emphasize an entire social identity or indicate community affiliation based on sexual orientation.[80]
Some historians and researchers argue that the emotional and affectional activities associated with sexual-orientation terms such as gay and heterosexual change significantly over time and across cultural boundaries. For example, in many English-speaking nations it is assumed that same-sex kissing, particularly between men, is a sign of homosexuality, whereas various types of same-sex kissing are common expressions of friendship in other nations. Also, many modern and historic cultures have formal ceremonies expressing long-term commitment between same-sex friends, even though homosexuality itself is taboo within the culture.[81]
Some scholars of anthropology, history, and sexology have argued that social categories such as heterosexual and homosexual are not universal. Different societies may consider other criteria to be more significant than sex, including the respective ages of the partners, whether partners assume active or passive sexual roles, and their social status.
One person may presume knowledge of another person's sexual orientation based upon perceived characteristics such as appearance, clothing, tone of voice, and accompaniment by and behavior with other people. Perceived sexual orientation may affect how a person is treated. For instance, in the United States, the FBI reported that 15.6% of hate crimes reported to police in 2004 were "because of a sexual-orientation bias."[82] Under the UK Employment Equality (Sexual Orientation) Regulations 2003, as explained by Advisory, Conciliation and Arbitration Service,[83] "workers or job applicants must not be treated less favourably because of their sexual orientation, their perceived sexual orientation or because they associate with someone of a particular sexual orientation."[84]
Two researchers, raising (1995) 'serious doubt whether sexual orientation is a valid concept at all,' warned against increasing politicization of this area.[85]
Professor Michael King stated, "The conclusion reached by scientists who have investigated the origins and stability of sexual orientation is that it is a human characteristic that is formed early in life, and is resistant to change. Scientific evidence on the origins of homosexuality is considered relevant to theological and social debate because it undermines suggestions that sexual orientation is a choice."[86]
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