I've often wondered something similar. I think it's because men seem to have a fear that gay men around them will "hit on" them and that somehow will make them appear gay. A LOT of my male friends are gay, and I've enver seen one make any advances on a straight man, so this mentality seems rather unfounded, but it seems to be how people are.

I've never really understood why some men find two women together so stimulating, or why some men (I hear this a lot from friends) allow their girlfriends to "fool around" with other women but not other men. Cheating is cheating is cheating, no matter who it's with.

The whole thing is really baffling if one looks at it from a logical standpoint. but oh well, nobody ever accused life of making sense!!