Perdoa-me Por Me Traíres (1980)

Glorinha, a middle-class 15 year old girl, always thought her mother Judite had killed herself, and that her father Gilberto has gone crazy as result. Her friend Nair takes her to a high-class bordello, where she wants to work. When uncle Raul, who raised her, discovers her prostitution, he decides to finally tell her all the truth about her parents' story.