Uncircumcised male with foreskin retracted, presents with large accumulation of smegma (sometimes called 'cock cheese'.)
Smegma is thought to be the cause of numerous penile and female urinary/genital infections. The male penis begins producing even greater quantities of smegma during puberty, and care must be taken to wash the penis regularly, from childhood throughout adult life if the male is not circumcised, to prevent the accumulation of this foul smelling substance.
The male with phimosis who is unable to retract the foreskin even when flacid (soft) may want to be circumcised to prevent the accumulation of smegma. Otherwise regular 'douche' with warm water to washout might help the build up.
Younger males should be regularly checked to ensure no phimosis exists and that no smegma has been allowed to collect under the foreskin or behind the glans.
http://www.circlist.com/anatterms/anatimages/smegma.gif
But do only uncircumcised men have a problem with smegma?
No.
"I was loosely circumcised at birth: I have a long inner foreskin remaining (about 2 inches), which spends most of the day folded up behind the glans. If I am sitting it usually covers the corona (rim of the glans). The inner foreskin secretes smegma, and, especially in the hot weather, there is a noticeable odor, as well as moistness. Although I do not produce anywhere near the amount of smegma that an uncut man does, I produce an amount which, during the summer at least, is inconvenient and unwanted. I think that the problem would have been obviated had I received a slightly tighter job: if the doctor had removed either more of the inner foreskin (possibly another inch or so) or if he had removed more of the shaft skin, resulting in a high-and-tight".
"I had a room-mate some years back who had a low-and-tight cut, with very little inner skin, and a very smooth shaft. He never produced any smegma whatsoever".
The moral is, circumcision cures smegma-problems, but some styles (high and/or tight) cure it better than others.
"Before I was circumcised (at age 30) I tried for years to eliminate the smell from my penis. I was scrupulously clean, and tried everything I could think of, but I never got rid of the smell completely. There was always at least a slight but noticeable odor for the first few seconds each time I got an erection, and this could be within half an hour of getting out of a bath or shower where I had pulled the foreskin right back and washed with soap".
Hope this all helps guys - Quotes NOT me