Barbara Scott, (Kay Parker) distraught and yearning for her son Paul, turns to her younger son Jimmy (virile Jerry Butler). Jimmy discovers his mother's affair with his older Bro Paul, and slowly his love for his mother turns to lust.

Barbara, jealous of Jimm's girlfriend (newcomer, luscious Lisa lake) begins the deliberate seduction of her youngest son. His lithe, muscular body enflames her with the passions she knows she should suppress. At the same time, Joyce McBride (Honey Wilder), Barbara's best friend and confidant, is enjoying carnal grafification with her own son, Bryon.

Taboo III takes us into the forbidden world of a mother's sinful lust for her handsome son. It delves deeper into the depths of raw passion than any other film.