Have you looked on the 'sexual problems' forum. There is a post on there that might help. You don't say how old you are. Could be lots of things. Why not see your doctor. Have a look at 'men focussed matters too. I hear horny goat weed is good. But only if you want to hook up with a horny goat. But , hey, don't diss it till you've tried it. Me and my 'sheepish' friend have lots of fun.