From a male perspective
Can you masturbate to orgasm? If so, try introducing him to shared masturbation. Sit/stand across from each other in the room, put on your best shows and bring yourselves to orgasm. If you can do it alone, but not in front of him, then your problems likely lie with feelings of shame or vulnerability; For one reason or another, you don't feel comfortable allowing yourself to orgasm in his presence. Even men can have this problem.
If you can't have an orgasm alone, you probably need to explore your own sexuality a little more. Try and allow yourself to imagine anything that will arouse you, regardless of offensive nature or otherwise, and try new things with your anatomy. If such a process makes you feel guilty, that is another issue you need to address (possibly with a psychologist).
Orgasms can't be forced by willpower for either sex; It's much more likely to happen when you are carefree and least expecting it.
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