A threesome with my friend and girlfriend? help
So one of my friends and I always make sexual jokes and stuff about my girlfriend and I's relationship, or make sexual jokes with each other. It never got too serious, until one day we both ended up joking about a threesome. (Of course it was a joke. I kinda just laughed and went along with the joke.) We both swore to never tell my girlfriend about those sexual jokes in the conversations we have (I don't really expect her to understand in a way, she does know him but still...) but after that one joke I can't get it out of my head.
Is it normal to think about having a threesome with your best friend and your girlfriend?