Most of the members in boy bands turn out to be gay: Backstreet Boys, Boyzone.... I don't listen to their music, but I don't have a problem with their sexuality either
I think it must have something to do with the irony. They're some of what's deemed to be highly attractive males that can sing and girls flock like crazy to them. Yet, they'd rather get porked by some stud than pork a hot chick.