Untreated ,prolonged STD causing inner vascular erosion. Very bad. STD clinic and urologist, then if negative, less likely invasive cancers, or other miscellaneous issue a urologist can see with a scope
what ever happened with your husband? I had a similar thing happen to me. It is not a fracture, but blood comes shooting out of my penis after I had rough sex with my girl friend.
Is he circumsized? If not, the skin may have been pulled back too far, which can cause it to bleed as bad as you described.
An erection works by severely limiting the flow of blood out of the penis, while the heart continues to pump blood into it. Blood pressure builds up, and that's what makes it hard. So it's not surprising that, if it starts bleeding, it will bleed profusely, even from a minor cut or damage.
I have no idea what could have caused this. I'm surprised the hospital didn't do more to find out the cause, rather than just treat the symptom, or at least recommend you husband to go and see someone to investigate.
I have no idea what caused this, but if it were me I, too, would be worried about it happening again, and I really think he needs to talk to a doctor about it.
I can see why this can be of serious concern to you and your husband, and I don't understand why he wouldn't want to see a physicial or wasn't treated properly at the hospital? It can be anything from Urinary tract infection, prostate cancer, STD or even kidney problems, but only a physician can properly diagnose and treat his condition.