[Rouge]

A large amount of orgasm is in your head. Let him go down on you, and as he does think about how sexy he looks, and the fact that he's licking you. The more you work your mind, the better your chances.

I wouldn't suggest anal as a solution to this issue, as it's generally much harder for some women to have an anal orgasm than a vaginal one. Go home and spring on him, explain everything to him, and then think, think, think!! Turn your mind on first, then your body will be fine.