You also might want to think of how just suggesting it makes her feel. If my BF ever suggested that to me I think I would bawl my eyes out feeling that I must not be good enough for him. I agree with previous posters that she probably feels pretty hurt by this. And I also agree that its good to have fantasies but maybe instead of acting them out could you guys watch a video of a 3some? Or talk dirty like youre in one without actually going the extra mile?