It doesn't really bother me, but I remember a friend of mine breaking up with a girl because of it. Another guy he vaguely knew had been with her before and filmed himself cumming all over her tongue and slapping his cock on it. The video circulated and ended up in my friend's possession and he finished the relationship because he couldn't bring himself to kiss her after seeing it... she was a great girl and everyone liked her but he just couldn't see past it. I've read on forums that some guys couldn't kiss a girl's mouth if they knew a guy whose cock had reached climax in it. Of course this doesn't only apply to boy/girl relationships... I use "girl" because its my preference. What are the attitudes of other people to this?