I have been going out with my girl for 5 years now. We are sexually comfortable with eachother and she is willing to try everything except having another girl join in on the fun. I have never had a threesome before, but it has been my life long dream. I don't want to cheat on her, but I really want this. Everytime i try and bring it up she shoots it down without giving me a chance to finish talking. Can someone give me some advise ?? Maybe i'm approaching it the wrong way ??