How to tell if a popular guy at your school is gay?

There's this guy, who's very popular amongst the rednecks at my school. Let's just call him "G". He likes to sleep around with chicks, so there's really no hard evidence that he's been doing it with dudes. He just has this look about him. He looks like a raging homosexual in cameo. His hair looks like a vagina with a perm. Sure, he's hot, but I know. I know that underneath all that hotness, there is a bag. A bag full of cow S H I T. How do you tell if a person like this is gay?