Anonymous wrote:OP here. Yeah, we're really honest with each other, although this subject hasn't been brought up before. It just happened over Thanksgiving - we were drunk at my parents' house, went up to my room for the night, and were just talking about shit and it came out. Now I'm afraid to ask him if he has fantasized about other women, or his exes.
He didn't seem ashamed of it, but he got uncomfortable when he saw how I took it.
Oh OP. Let me make it simple for you. He's fantasized about other women. He isn't ashamed of this because it's nothing to be ashamed of. He isn't going to sleep with this friend anymore than you're going to sleep with George Clooney or whatever celebrity you fantasize about. He got uncomfortable because your reaction made him think he'd done something wrong.
Please do not ask him if he's fantasized about other women. Please do not ask him about his exes. If you must discuss this with him (and it sounds like you need to talk), you can something along the lines of "Boyfriend, when we were at my parents and we had that awkward drunk moment where you told me you thought about Rita when you were masturbating, I realize that my reaction made you uncomfortable. I was uncomfortable myself because I hadn't thought about you doing that. The only people I ever think about when I masturbate are you and George Clooney. I love you very much, though, and I'm really sorry it was a weird moment." And then do your best to continue trusting and loving him.
In answer to your OP: yes, what he's doing is normal.