Hi my son is 15 years old and is complaining of dribbling urine after masterbating. He has been having this problem for 2 to 3 years now and it doesn't happen very often. I'de be very interested to find out what this is. Some months ago, for a completely unrelated issue we saw our local doctor and a a urine sample was requested but everything showed up fine, i dont know if that counts for much. He ejaculates normally but once he's finished masterbating he says he goes for a pee normally afterwards without pain but sometimes immeditatly after or 5 minutes later, he developes pain in his penis and a weird feeling pain under his anus. Is this serious?