This issue was sort of dealt with in a thread about taking a long time to cum. Having been with several guys (all healthy and under 30) over the years who took a long time and a lot of effort to cum, both with someone else and by themselves, I think there are a lot more guys out there with these kinds of problems than anyone would guess (especially since this is the exact opposite of the much-joked-about premature ejaculation). As I have before, I agree with others here (such as sykray) who say go see a professional, not just any old medical doctor, but a sex therapist tuned in to both physical and psychological issues. And I doubt that circumcision (or lack thereof) has anything to do with it. All cut guys and all uncut guys should be able to cum equally and with a lot less effort than giving birth to an elephant.