Hirschfeld, Magnus (1868–1935)
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From 1899 to 1923, Hirschfeld and the committee published the Yearbook for Sexual Intermediaries (Jahrbuch für sexuelle Zwischenstufen), which provided materials of interest to homosexuals, transvestites, androgynes, hermaphrodites, and other sexually liminal types. Hirschfeld’s theory of intermediaries drew from the third-sex theory popularized by Karl Heinrich Ulrichs in the 1860s. Both suggested that the homosexual was an intermediary type between male and female heterosexuals, exhibiting the physical attributes of one sex while manifesting the emotional characteristics, behaviors, and drives of the other. Aware of the incredible diversity of human sexual behaviors, Hirschfeld hypothesized the existence of more than forty-three million types of intermediaries.