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This book is an attempt to assemble information regarding homosexuality from history, sociology, zoology, genetics, endocrinology, anthropology, law, psychology, and psychoanalysis. The outstanding section is the introduction. Here Marmor discusses definition and reflects on the need for a qualitative definition of homosexuality and suggests that this definition must combine both operational and motivational aspects. He considers a homosexual to be a person who is motivated in his adult life by a definite preferential erotic attraction to members of the same sex and who usually (but not necessarily) engages in overt homosexual relations with them. He comments on genetic studies (Kalman's) and feels that they are inconclusive. He questions Freud's hypothesis of innate psychological bisexuality and feels there is evidence to support Rado's idea of psychological neutrality at birth. He also refers to the idea of a possible analogy between the establishment of gender role in early childhood and the phenomenon
Marcus D. Sexual Inversion.. Arch Gen Psychiatry. 1966;14(6):662-663. doi:10.1001/archpsyc.1966.01730120102020