Here is a scenario.
You recently met a girl and you are actually in a relationship. Let’s say her name is Melisa. So one day your girlfriends finds out that you have been seeing Mel and she doesn’t say anything and you don’t know that she knows about Mel. Then one day you are from work, or something, exhausted and all you need is your gf besides you, watching tv and just chilling basically. Then you go into your bedroom and find Mel and your girlfriend having sex.
This is a real scenario, don’t think of it from a really sexual mindset, this is your wife and your sidechick having sex.
What would you do?