Intruso (1993)
A wife lets her broke and ill ex-husband live in her house. She comes into his bedroom and screws him one night, with the knowledge but not the consent of her husband.
Actors: Antonio Valero
Los Borgia (2006)
Two Borgia brothers cuckold their younger, push-over type brother separately.
Family Games (aka Juegos de familia)
In this Spanish comedy-drama, a man befriends his wife’s lover in an attempt to understand what has happened to their marriage and win her back.