I was wondering If anyone had advise on how to flirt with a guy to know If he might be gay if its posssible?
try just looking at him, not staring and drooling, but catch his eyes and smile. If he is gay he will probably reciprocate, if it turns out they aren't then no harm no foul. What a guy can make a friendly gesture?
ThePug has a point, you need to try and make sure that you're kinda secure about how he floats. Otherwise, the flirting might unintentionally break the friendship you have. If, however, you are sure that he won't take it the wrong way, you should try some subtle things, perhaps a few glances here and there, and smiling never hurts! I always found the best way to flirt is subtely...