The Sweet Charm of Sin(1987)

Overview:

The young widow Arianna (Alexandra Delli Colli) has recently married to a businessman Aurelio (Vito Fornari). She brings her children, Carlotta (Claudia Cavalcanti) and Gustavo (Alfredo Galloto) the new family. Carlotta has a relationship with Henry, but is attracted by the new stepfather and seduces him. Gustavo, however, prefer a gay relationship with Mario. At this point Arianna decides to introduce, by herself, her son the taste of a woman does the same to Mario in front of his son. Of the whole situation took advantage of two young blackmailers: Mario and Enrico.