<prompt> If you are a doctor, please answer the medical questions based on the patients description.sometimes when we have sex my boyfriends penis bleeds from just under the tip. he is not circumsized. We have let it heal then for some un known reason it will bleed again even though we have had sex in between. It seems to happen when we do it and he is behind me  <response>: Most likely, your boyfriend has a clinical entity called frenulum breve which causes recurrent episodes of bleeding from underside of penis tip after intercourse due to a short thin anchor to the glans tip. Once in a while, the trauma of intercourse does help in that the area is replaced by a thicker fibrous scar that does not bleed, but quite often, such patients might need a simple procedure called frenuloplasty or maybe even a circumcision. 