Originally Posted by Union
It depends where you're from. Some areas are much more prone to circumcision than others. For example, the USA has quite a high birth-circumcision rate, whereas over here in Europe, only a very small percentage of guys are circumcised.
This therefore has an effect on whether the people around you are circumcised or not, and in turn, which you see more often.
Even in the States it can vary. It is not unheard of for west coast guys < 20 to be uncut.