For non-camp gays who are in the closet... well it's easy. Glances at good looking men. They will slip up sometime!! The more polite and respectful they are to women, the more likely they are gay. If they're about to be set up with a girl or people are tryin to set him up but somehow no one is right. If he rathers girls company on nights out OR if he prefers to hang out with his good lookin male friends
I dunno, I have a good gaydar though