Goaded by his buddies, a nerdy guy who's never "done the deed" finds himself in a position where he must tell his virginal friend Cal that he is gay. He does this in the infamous "you know how i know you're gay lines" scene from The 40 Year-Old Virgin. You can use these lines to let people know you're a gay person and make them listen to you. However, you should remember that having sex with a man or a woman does not necessarily mean you are gay. Sexual orientation is a complex and personal aspect of who you are.