| There are some topical ointments that may help with this problem. They act by de-sensitizing the area where it is applied. I would google your headline and see what comes up, no pun intended!
Really, your mind is your biggest sexual organ and that is where this problem probably originates. Have you tried thinking of something else while you are having sex? It might help, but I know it is a difficult thing to do.
I have read that men who masturbate often can experience this problem too. If that applies to your situation, try laying off the self stimulation for a while and see if you get any improvement.
Good luck!! | 
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