Repost your question in the Ask A Doctor urology forum and see what he advises; or there is an Erectile Disfunction Ask A Doctor forum. I had a problem mixing drugs and sex and once I cut out the drugs, everything was fine.
No OTC, no illicit drugs. I had a physical not too long ago and prostate was ok (exam and blood screen). Think I should still see a uro?
Just off-the-wall questions: Taking any new drugs lately such as propecia or vicodin or anything over-the-counter? Mixing drugs(cocaine, etc.) with sex? Prostate problems? A urologist may just tell you it is age-related, which will make you want to punch him.