I was circumcised at 20 for medical reasons, a surprisingly high no of men have problems down there, they usually suffer in silence, basically the problem is caused by parents not checking the foreskin retracts. There is the benefit of always being clean, but you are less sensitive and therefore you get less out of blowjobs and shagging. You are also less likely to get aids or the clap. But if everything functions leave well alone. A sauna girl told me that about 50% of her customers had a foreskin prob, and I know that she had her son circumcised at the age of 15 cos she realised that he had a prob. A lot of men have a truly crap sex life, because there foreskin doesn't retract, we are just to prudish to talk about this stuff.