Actress/Film: Marilyn Monroe, The Seven Year Itch (1955)

Cheating On/With: Um, nobody. And with nobody. But look, that's not the point - family man Richard Sherman (Tom Ewell) is utterly convinced that he's going to break at some point, and that he'll be literally powerless to do anything about it. It keeps him up at night.

Alright, We Forgive You: She could be trailing broken family men like candy wrappers, and we'd still have to give her the benefit of the doubt because on hot days SHE KEEPS HER UNDERWEAR IN THE FRIDGE. Win.