Milo, no, I'm cool with group sex, its just the fact that a close friend of mine's finace happens to be one of the girls that I'm screwing during this is uncomfortable for me. He keeps reasuring me that it isn't a problem and he actually feels better if while doing this the guy screwing her is a friend rather than someone he hardly knows, and that he isn't worried about me getting attached to her and wanting something more than sex out of it.