I wold guess that he could have an enlarged prostrate that is restricting the blood flow to the penis. However it could also be that the penis is getting to much blood flow when erect. Either way, I would suggest he see a urologist.
my husband seems to have a similar problem except that his whole "head" hurts. Its kinda reddish and (since he's uncircumsized) when he pulls back the skin gently he says it hurts and it looks like the skin is peeling. He's the only man I've been with and I'm the only woman he's been with so what could've caused this?
im not sure what could have caused that, but i was also feeling some pain during sex with my girlfriend and couldnt figure out what to do, i looked on the internet for free advice but couldnt find any, then i came across www.naturalpenissecrets.com and after a month or so of doing the exercises from the online manual they had i noticed that i had full control over my penis because they actually showed you how to build the muscles in your penis and how to have a better blood flow to the penis, to top it all off in about a month or so i started seeing gains. I gained over an inch and some in a little over than a month and orgasms during sex were more intense, i just kept it all on the d/l from the gf and told her i was just trying harder. Anyways, hope it helps.