Having known some gay guys, I have to confirm Heavy Artillery's opinion on how gays feel about Yaoi art.
If I can paraphrase from memory what I read in a blog once...
"Real Gay sex isn't pretty and flowery like you see in Yaoi art. Real Gay sex is about Guys having sex with Guys. And when we do it, it isn't pretty. We grunt. We sweat. We claw. We bite. We swear. And we get really messy."