bro, I've been in this situation with my girl before, I acutally met my girl in a 6-some, we had amazing sex and I knew right then and there she was the one. On several separate occasions, my girl and her best friend and I would have a 3some. After developing feelings for one another, we had to stop doing that due to the jealously factor. on several occasions, she has asked me if we can pick up another couple and party with one another. She wants to experience another woman, which i have no problem with, but when it comes to another guy banging her, I cant' stand the thought of that, and have told her this. She respects my wishes, which is very cool.