maybe focusing more on 4 play really finding what you like rather than getting straight in to the sex first and let him know you want to do this so he understands your not feeling your needs are being met as much as his and you want to be able to finish with him
I'm sorry, I don't know the answer, though someone here might have some ideas. You might also want to post this over in the Men's Health community. There is a good Asian guy who recommends interesting stuff and I think he mostly posts there. Or try the Sexual Health community.