Promiscuity, the Street Kids of Katia (1969) on Netflix

A young woman cheats her impotent husband with the surrounding teenagers.

Mauro, a young railway engineer and happily married to beautiful Kátia, lives in complete harmony with his father-in-law, Sergio, Kátia's brother, Beto, Adriana, Paulo's wife and Kika, Beto's girlfriend. On one of the family's trips to the railway terminal, Mauro suffers a violent fall and falls into a coma. Hurriedly taken to the hospital, however, he recovered due to the severity of the internal injury, he becomes definitely impotent. Mauro, uncomfortable with the new situation, is drunk all the time, becoming a dead weight for the family and especially for his young wife. The family spends every weekend in a small farm on the banks of a dam and there, they give vent to all sorts of libidinizations. The maid Nora now has sex with Sergio, now the alleged head of the family. Adriana besides having relations with her father-in-law, she also has Nora and Beto, who in turn also fucks Adriana, her sister-in-law. Claudinha, a young surveyor comes to know Marcos and they start a romance and have sex. Kátia, who had already tried everything, finds a new way in a boat dock. Boys fishing every day. Win their friendship and start having sex with everyone. Spreading the fact, the kids line up to have sex with her. The family can no longer stand the situation, and Mauro is always half drunk and has fun with everything.

—Letter B.