[Cry Me A River]

Why isn't the lathe in his bedroom? That's retarded!

Here's the way out of your situation... You, or one of your other good roomates needs to "come out" (hey, take one for the team!) and start hitting on this guy. Repeatedly and constantly. When he complains, you guys all have to stick together, call him a homophobe and insist the rest of you are all open minded... If you really want to get him out fast, start regularly making out in the livingroom with your other roommates.