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Have you tried talking to him about it?
My suggestion as a man:
Find an appropriate time to talk when both of you are calm and in a good mood, perhaps after sharing a nice meal together in the privacy of your own home. Sit him down and tell him that you want to talk, and not to interrupt until you are finished expressing yourself. Tell him how you feel about him. First emphasize how much you care and respect him and find him attractive. Be truthful and use your own words, say that you're not patronizing but really mean this (because you should). Then tactfully bring up that you feel dissatisfied during sex, and that you want to improve your sex life together because he is important to you in so many ways. Maybe suggest that you two do some research together in how to pleasure each other better. Ask him to do things you feel would satisfy you, oral, fingering, etc before penetration. It's normal for a woman to orgasm before her male partner does.
He may get upset of feel embarrassed, no man wants to hear that he can't satisfy his woman, especially if he cares for her. It's more than likely that any anger isn't directly towards you, but towards himself. The conversation could go anywhere from here, just make sure to stay calm and caring during this. Hold his hand, even if he tries to pull away. Show your affection and continue to emphasize your genuine attraction to him and you want to improve your relationship in every way.
/advice column
Feel free to ask any questions, I don't mind giving perspective. I'm proud of you for wanting to do the right thing instead of looking somewhere else for satisfaction.