Rudolf von Urbantschitsch, (later) Rudolf von Urbantschitsch (29 April, 1879, Vienna – 18 December, 1964, Carmel, California) author of Sex Perfection and Marital Happiness (Rider & Co 1952), was an Austrian psychiatrist and psychologist who researched human sexuality. His work describes a type of bio-energetic flow of energy that is possible between couples when orgasm is avoided and sexual intercourse is prolonged.
The findings of his research indicate that improved over-all health and well-being are a result of engaging in "Sex Perfection". The methods advocated are similar to those of John William Lloyd, Alice Bunker Stockham, as well as many of the tenants of the Tantra.