This work presents the interaction of physiological and psychological factors in the sexual function of women. It covers: the theory of the sexual instinct, developmental factors, the sexual cycle, orgasm and frigidity, and the procreative function. Every phase involves a shifting and reorganization of psychic structures. The giving and expansive attitudes needed for the procreative period become outweighed step by step by the restricting, self-centered tendencies characteristic of old age. (68 pp.)