I'm a guy in my mid-twenties, always had strong erections up until now, but recently I've not been able to get full erections during sex. It's gets to about 80% erectness, but never full. So some sort of sex is possible at some times, but it it's just too unreliable to be any good and me and my partner (who's thankfull v understanding!) keep having to stop. Last year I was circumsised (which may be completly irrelevant, but just putting that information out there). I'm seeing the doctor next week, but thought I'd ask here in case any other younger guys like me have had similar problems? Any advice?