Trapped Ashes (2006)
“I didn’t care that Stanley was my best friend. I didn’t care that it was his house, his bed. I just wanted to screw his girlfriend more than I’d wanted anything in my life.”
cheats with a non-human
Extraneous Matter (2021)
A young woman trapped in a loveless and definitely sexless relationship is attacked by an octopus alien that hides in her closet and while at first this is assault, it soon gives her sexual pleasure. By the end, everyone in her life, including her boyfriend, has partaken in the sexual nirvana that this creature can create.
Underwater Love (2011)
A fish factory worker cheats on her fiance (her boss) with a kappa: a Japanese mythical water sprite who is in fact the reborn form of her old crush.
Possession (1981)
A young wife left her family for an unspecified reason. The husband determines to find out the truth and starts following his wife. At first, he suspects that a man is involved, and there is. But gradually, he finds out more and more strange behaviors and bizarre incidents that indicate something more than a possessed love affair.
Prey (1977)
A chick cheats on her lesbian partner with an alien disguised as a man.
Max My Love (1986) aka Max Mon Amour
The French wife of a British diplomat in Paris takes a chimpanzee as her lover.
Hush (TV Series) (2019)
A guy cheats on his live-in fiancee with their co-worker, but a plot twist in the end will reveal how screwing horny his fiancee is. Plus, a couple goes to a swinger party, a chick cheats on her fiance with a lesbian, and a wife cheats on her husband with an otherworldly being.
Snaker
A wife has sex with a snake.
Bestialità (aka Dog Lay Afternoon)
A young girl witnesses her mother having sex with the family dog. When her father finds out, he burns the dog alive. She is so traumatized by these incidents that she later turns into a nymphomaniac. She moves to an island and lives there with her own dog, having sex with various guests who visit her.
La Criatura (aka The Creature)
Tender and erotic love story of a respectable bourgeois housewife and a large black Alsatian dog.