Why is it that whenever a guy is 'naked' on his own, they are automatically put in to a 'gay' category?

Why not put them in to a category such as...

Males
Guys
Solo Men
Etc...

I know its stupid but sometimes this really bugs the hell out of me, just because a guy is on his own and naked, that doesnt make him suitable for a gay website $0.02

Regards,

Lee