pt. I. The origin of sexual repression -- Sex economy in matriarchal society -- Economic and sexual contradictions among the Trobrianders -- The invasion of sex-negative moralism -- Primitive work-democracy-Mother right; father-right -- Confirmation and revisions of the Morgan-Engels Theory -- The origin of clan division and the incest taboo -- pt. II. The problem of social sex-economy -- Appendix: Roheim's "Psychoanalysis of primitive cultures."