Believe it or not, I think it's the "EWWW!" factor in many cases. Maybe not in the virulent kind of homophobia but in the kind where a straight guy, who happens to see two guys kissing, says, "That's just disgusting." meaning that HE would never do that and how could anyone else? Yes, narrow mindedness - or maybe a simple lack of enough imagination to get that someone may actually LIKE to do that sort of thing. This really was said to me and I answered, "Maybe it feels that way because it's not something you normally see?" He changed the subject after that.
Never kissed a guy but is beginning to think it may not be all THAT bad
helen