Taboo American Style 3: Nina Says ' I'll Do It My Way, ' and Becomes an Actress (1985)

A four-part saga of a young woman's sexual awakening, and the power she attains with it. In part 3, Tom, the son at the university fucks his juicy girlfriend Marylyn. Meanwhile, Nina, the daughter is still having sex with her daddy, Harding, while her mother, Emily, slowly turning into a zombie under the action of tablets, which her daughter feeds her as tranquilizers, Nina manages to seduce her brother and then Marylyn in lesbian sex with her, including after in the teen threesome. The mixed relations culminate with Emily, the mother when enters the bath to wash her son, ignoring his objection that he is now an adult, 19, and telling him about the incest of his father and daughter.