Hot foursome: What is it, you ask? It's when two (or more) girls have an affair and the couples get together, often times in a hotel room. Why would any self-respecting Christian want to go to a hotel to have a foursome with a girl if he is married? I'm not trying to be judgmental, but saying that foursome is a sexual encounter between adults is a given. So Christian parents, be aware that if your daughter wants a threesome with her boyfriend and you say no, she may turn to another Christian family member instead of you..