Third Sex.

Information related to the term third sex is presented. The popularity of the term is related to its use by some representatives of the early homosexual rights movement in Germany. An overview of the three sexes of mankind, male-male, male-female, and female-female is offered. It mentions its usage in the 19th century literature. German scholar Karl Heinrich Ulrichs used the term third sex to refer to homosexuals. It cites psychoanalyst Sigmund Freud's perspective on sexuality.