Diagnoses are often seen as purely scientific descriptions of objectively "real" entities. In contrast, this course approaches diagnoses as social artifacts and collective achievements: phenomena created in, and marked by, particular socio-historical contexts. We consider a variety of historical and contemporary diagnoses, but focus on medical categories related to sexuality, sex, and gender (e.g., onanism, hysteria, nymphomania, inversion, homosexuality, FSD, GID, ED, and the paraphilias). Along the way we consider issues of power and social control, as well as various diagnosis-related phenomena (e.g. disease mongering, diagnostic advocacy, enhancements and "lifestyle" drugs, the rise of diagnostic biopsychiatry, and medical social control).