I am a 37 year old, circumcised male with no other sexual problems (no erectile issues, etc.). I've been monogamous for 13 years now. The issue that I have is that right before the moment of orgasm, the tip of my penis gets overly sensitive (NOT in a good way) and I stop all movement that might but pressure or friction against it. Obviously, this prevents me from reaching orgasm, though I usually ejaculate).

No other parts of the penis are affected, only the tip. Oral sex is extremely gratifying because my wife is aware of the issue and is very careful, but with intercourse there's nothing to be done.

I've had my PSA test done recently with no prostate issues.

Any suggestions out there? Lubrication is not the issue, we've tried cream/no cream...