A woman gives up the love and protection of her older incestuous brother when she begins having a romantic affair with another woman, but the brother finds out and purposely begins a secret affair with the same woman.

A woman gives up the love and protection of her churlish older brother, Buster, when she begins having a romantic affair with another woman. Buster finds out and begins a secret affair with the same woman just to spite his sister.—Anonymous

What makes a girl finally give up the love and protection of her BIG BROTHER? Could the answer lay in the soft arms of another? Who is it, that SIS' sweetie really wants? Does her hairdresser know? Does big brother, or sis, know FOR SURE? The 'monkey" business really gets under way, when "Buster" gets eyes for Sissy's action, and decides to cut in. Sis, is unaware of the goings-on between her churlish, brother and unfaithful friend, until her simian pet Lamont, who is real clever, with a camera, reveals the whole sordid mess. Then, it's sis' turn to go APE, and try to turn the tables on her brother's guerrilla tactics. Thus, the confrontation and conflagration. But in the end, it's brother and the chick that swing together, leaving sis and her chimp to find new kicks in the jungle of desire.—pressbook synopsis