Emmanuelle bianca e nera (1976)

In the pre-civil war American south, Emanuelle, a plantation owner's daughter, while outwardly a dainty southern belle, brutally abuses the slaves in her charge. When her fiance is bitten by a snake, he falls for Emanuelle's beautiful African-American maid who's kindness and skill saved his life. Insanely jealous, Emanuelle continues her sadistic behaviour towards her charges, and when her fiance announces he plans to wed the maid, Emanuelle "gives" her to her even more brutal hired men, and her fiance is powerless to stop them. Can Emanuelle learn an important lesson in love before it's too late for everyone?