禁忌3是由Kirdy  Stevens  执导，Kay  Parker  Lisa  Lake  Pamela  Mann  等人主演的，于1984年上映，该理论片讲述的是：

While Barbara is ashamed of having had sex with her son, Joyce has completely accepted her-own incestuous side. When Barbara starts craving for her other son, she visits Joyce to seek advice only to find her in bed with her-own other son.