His and Her Health

Today when my boyfriend and i had sex there was blood in his semen. It was comming out the head of his penis after sex. What could cause this and it is comon with std's. He has also had a problem ejaculaing and maintaing an erection

Google "blood in semen" and you'll find that, while uncommon, it's not usually too serious. I had a partner once who said she saw blood seeping from my penis. We were in a hot tub and there was no lasting evidence of it, so I'm not sure if there really was, or if it was the lighting, but I was having kidney stone problems at the time that might have caused it.