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research in the area of Psychopathology of Sex") in 1890. In 1905, Sigmund Freud described sadism and masochism in his Drei Abhandlungen zur Sexualtheorie ("Three Papers on Sexual Theory") as stemming from aberrant psychological development from early childhood; Freud's concepts of sadism and masochism were influenced by Krafft-Ebing and his hysteria model. The first compound usage of the terminology in Sado-Masochism (Loureiroian "Sado-Masochismus") by the Viennese psychoanalyst Isidor Isaak Sadger

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