To be perfectly honest, my source on the whole up-the-butt = gay thing is not the most reliable. You see, my friend Al isn't really the gayest guy I know - that would be Jay, my best friend in primary school, who lives up north somewhere with his boyfriend. But I haven't see him in like ten years so he doesn't really count. I can assure you though that Al is really very gay - he just doesn't seem in the least bit inclined to pursue it in any way, or even to explore his gayness. But he really is quite gay.
I hope that helps make things clear for you.