Ask the Little Bald Bastard

Dear Little Bald Bastard,
  Okay, so how do you break it down to a roommate that no, you don't wanna experiment and thank you-but uh...you don't really need to have gay sex with them to become closer?
-John Smith
Dear Obvious Psuedonym,
  It depends the reaction you expect to receive. If your roommate is reasonable, then simply confront him honestly. If you expect tears and a tantrum, try telling him just before you go away for the weekend. If he's a loner with an extensive collection of guns, get used to putting out.