I have a very helpful tip for uncircumcised males regarding smegma buildup. Smegma can have a strong odor that is very distinctive, and it can be embarrassing when in an intimate encounter. It's pretty well known that uncircumcised men must keep the area beneath their foreskin clean, but it's my understanding that smegma buildup (the odor, not the physical buildup itself) is not necessarily an indication as to whether your foreskin and glans area is "clean" or not. I recall beginning to notice it when I was around 16 (I'm 28 now), and when I attempted to clean the area with soap and water, almost always the odor would persist. Some of the uncircumcised guys may already know about this trick, which I figured out when I was around 18: I came up with the idea to retract the foreskin and immerse the glans and retracted foreskin area in mouthwash. It worked like a charm! The antiseptic qualities seem to completely eradicate the bacteria that cause the odor, and (and despite what one may think, it DOES NOT feel the same down there as it does in your mouth) it is not painful to do so. The sensation it produces could be considered by some to be mildly uncomfortable, but it disappears very quickly and keeps your penis clean and clean-smelling. At first I was concerned about potential side effects/health risks, but after doing it for almost a decade now, it's clear that the solution has about the same effect on the penis as it does on the mouth. (Interestingly, the tissue in both can be considered somewhat similar.) I certainly hope this can be useful information for some – it sure has for me!
Editor's note: Natural prevention works better. Pull back your foreskin while urinating, keeping the area dry. No smegma or odors if bacteria have nothing to feed on.