[TryingMyBest]

Well, my girlfriend and I have been dating for a while now. While we haven't had sex, we do practice mutual masturbation. The thing is that she gets, seemingly, frustrated by the fact that she orgasms before me. The thing is that I enjoy some anal pleasure to increase the potency of an orgasm while masturbating by myself (this also hastens the orgasm). As I enjoy it by myself I would also like to do it when we are together. I really don't know how to go about bringing this up to her. Here are some issues that come to mind:
1. Will she think that I'm not satisfied with her HJ. (which I'm not)
2. Will I have to explain that I'm not bi-sexual.
3. Will she be turned off and just leave me.
GAH!! Any ideas on how to make this work?

p.s I have brought up anal play a few times and she doesn't seem to be interested at all.