such as: nymphomania, fetishism, and homosexuality. Psychiatrists were now able to diagnose psychosexual disorders in place of perversions. Psychopathia Sexualis was used as reference in psychological, medical, and judicial settings. Krafft-Ebing is considered the founder of medical sexology; he is the predecessor of both Sigmund Freud and Havelock Ellis. Havelock Ellis Havelock Ellis was an English physician and writer born in the eighteen hundreds who studied human sexuality, and is referred to as one of the earliest sexologists. Ellis's work was geared towards human sexual behavior. His major work was a seven-volume publication called Studies in the Psychology of Sex, which related sex to society. Published in 1921, Studies in the Psychology of Sex covered the evolution of modesty, sexual periodicity, auto-erotism, sexual inversion, sexual impulse, sexual selection, and erotic symbolism. Ellis also conceived the term eonism, which references a man dressing as a woman. He elaborated on this term in his publication of Eonism and Other Supplementary Studies. He wrote Sexual Inversion as well in hopes to address any ignorance people have on the topic. See also LGBT rights in Turkey Psychoanalysis Sigmund Freud Psychosexual development References External links Freudian psychology Paraphilias