Groin

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The groin is the crease (either fold or hollow) at the junction of the torso with the legs and the adjacent region that includes the external genitals, also called the crotch. The term may be used as a euphemism for genitals, since the names of the latter are taboo words in some cultures. When someone has "pulled his/her groin muscles", usually, this person has pulled a muscle in the inner thigh.