Dr. Jeremy Lodge (Jamie Gillis), a very strict father and psychologist, had sent his two daughters to a boarding school. The eldest daughter Naomi (Karen Summer) is caught having sex in her bedroom and was expelled from school. When the two sisters come home, Dr. Lodge discovers that his wife (Cyndee Summers) had an affair with his brother (John Leslie) and angrily throws it. Naomi decides to live with his mother and uncle (later revealed that his biological father), while Robin (Ginger Lynn) decides to stay with his father. Naomi (“bad girl”) seduces her uncle and has sex with him while Robin (“good girl”) develops the desire for his father. Dr. Lodge runs a support group incest and their patients include Joyce McBride (Honey Wilder) and Barbara Scott (Kay Parker), who appears in the film only in the short memories.