Homosexuality
In his influential 1962 study, Homosexuality: A Psychoanalytic Study of Male Homosexuals, Irving Bieber characterized male homosexuality as a pathological condition and an "acquired adaptive behavior" resulting from childhood trauma. He rejected the idea of natural variation, arguing instead that a specific family constellation—primarily a "Close-Binding-Intimate" mother paired with a detached or hostile father—disrupted a boy's innate heterosexual development. Bieber maintained that homosexuality was a "crippled" response to a fear of heterosexuality, but one that was potentially reversible through intensive psychoanalysis, claiming a 27% success rate in converting patients. While his work dominated psychiatric thought for a decade and fueled opposition to the APA's 1973 declassification of homosexuality as a mental disorder, modern scholars now widely criticize his findings for selection bias, as his research was based exclusively on men already seeking psychiatric treatment.