Sexo Profundo (1981)

Wealthy Silvia is married to unfaithful Alexandre. She catches her husband red-handed with a woman in a nightclub and Alexandre promises a new start for the couple. Silvia is upset and decides to fly in her airplane, but the weather is not suitable and she returns to her farm. She surprises Alexandre in a compromising position with her seventeen year-old sister. Silvia sends her husband away and puts her sister in a boarding school. Silvia meets Alexandre and sleeps with him. Out of the blue, she castrates her husband with a razor blade and chains him in the attic with an opening to her bedroom. Then Silvia brings every man and woman in the neighborhood to have sex with her and to excite her husband, who becomes desperate with his libido. In the end, she crashes her plane into the farmhouse.