The Love That Is Wrong (1993)
A girl in a lesbian relationship wants a male suitor to impregnate her. Her partner reluctantly agrees and gets really hurt when she sees her screwing the guy and really enjoying it.
cheats with co-worker
The English Patient (1996) – Kristin Scott Thomas
A mapmaker bangs the wife of his fellow mapmaker while mapping the African landscape.
Crazy, Stupid, Love (2011)
A wife confesses to her husband that she slept with a co-worker and wants a divorce.