Perversion also released as Perverso and Estupro is a 1979 Brazilian exploitation film directed by Jos Mojica Marins. Marins is also known by his alter ego Z do Caixo in English, Coffin Joe.
Palestrina is acquitted of rape on the grounds of insufficient evidence, and laughs at the victim when the judge gives the verdict. He commemorates his triumph with a party at which he proudly displays the severed nipple to his guests. Palestrina continues to seduce other young women until he develops a passion for Veronica, a beautiful young medical student who is not as susceptible to his charm.To obtain Veronicas love and loyalty, Palestrina must endure a more traditional courtship Veronica requires him to proclaim love and propose marriage before she relents. When he finally does, Veronica allows Palestrina to consummate their affair with a long, passionate episode of lovemaking. As he settles into a peaceful post coital state, Veronica calmly reaches into her purse and removes a surgical knife with which she castrates him. She then has flashbacks which reveal that Veronica is Silvias sister. ........
Source: Wikipedia