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Large scale studies of sexual behavior, sexual function, and sexual dysfunction gave rise to the development of sex therapy. Until that time, American sexology consisted primarily of groups working to end prostitution and to educate youth about sexually transmitted diseases.Alfred Kinsey founded the Institute for Sex Research at Indiana University at Bloomington in 1947.Sexologists apply tools from several academic fields, such as biology, medicine, psychology, epidemiology, sociology, and criminology.Topics of study include sexual development (puberty), sexual orientation, gender identity, sexual relationships, sexual activities, paraphilias, atypical sexual interests.That work is considered as having established sexology as a scientific discipline.In England, the founding father of sexology was the doctor and sexologist Havelock Ellis who challenged the sexual taboos of his era regarding masturbation and homosexuality and revolutionized the conception of sex in his time.

(Prostitution in the City of Paris), an early 1830s study on 3,558 registered prostitutes in Paris, published by Alexander Jean Baptiste Parent-Duchatelet (and published in 1837, a year after he died), has been called the first work of modern sex research.It also includes the study of sexuality across the lifespan, including child sexuality, puberty, adolescent sexuality, and sexuality among the elderly.Sexology also spans sexuality among the mentally and/or physically disabled.This is now called the Kinsey Institute for Research in Sex, Gender and Reproduction.He wrote in his 1948 book that more was scientifically known about the sexual behavior of farm animals than of humans.

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