The Killer Is on the Phone (1972)
A wife who has amnesia can’t remember her current husband but clearly remembers fucking her lover.
Italy
The Magnificent Cuckold (1964)
A guy bangs the club president’s pretty wife at a hotel. Because of this, he gets paranoid and suspects that his hot wife is also cheating on him, so he starts spying on her and following her around.
Tinto Brass Presents Erotic Short Stories: Part 4 – Improper Liaisons (1999)
A niece bangs her uncle, her uncle’s new wife, her male cousin, her female cousin’s boyfriend, and the dog. Just kidding about the dog, but if her uncle has one, she probably would have.
Cheeky (2000) aka Trasgredire
A Russian fox cheats on her boyfriend several times and lies through her teeth despite overwhelming evidence.
Trhauma (1980)
Among a group of friends, one husband blackmails the wife of another for having some lesbian action with his own wife.
Candido Erotico (1978)
A guy is hired by a couple to fuck the wife while the husband watches and to also have a threesome with them. He falls in love with their daughter and marries her, to the couple’s chagrin. He can’t perform in bed with the daughter without an audience, so his mother-in-law suggests something.
Monamour (2006)
A husband finds out about his wife’s affair and slaps her. She calls him a cuckold and continues screwing the other guy.
A Bigger Splash (2015)
A producer and his daughter visit his ex-girlfriend and her lover in Italy. The producer screws his ex-girlfriend while his ex-girlfriend’s lover screws his daughter.
I Am Love (2009) – Tilda Swinton
A rich man’s wife likes the taste of a chef’s cooking, so she tastes the chef too.
Bali (1970) aka Incontro d’amore – Italy
A wife wants to cheat with a husband’s friend, but he’s too immersed in his spirituality crap to care.