-Secondly, only 30% of the world's population is circumcised. Specifically 30% in America in 2009. And 20% in Europe.
-Thirdly, a large number of independent studies have shown that women find circumcised penises to be more pleasurable.
-Finally, the penis DOES indeed have a function and serve a purpose:
http://www.psychologytoday.com/blog/...ical-realitiesThe function of the foreskin for women in intercourse is to seal the natural lubrication inside the vagina and provide a gentle internal massaging action. The intact penis moves in and out of its foreskin, which provides a frictionless, rolling, gliding sensation. Intact men tend to make shorter strokes that keep their bodies in contact with the clitoris more, thus aiding female orgasm (O'Hara 1999). On the other hand, the circumcised penis functions like a piston during intercourse - the head of the penis actually scrapes the lubrication out of the vagina with each stroke. As the man thrusts, his skin rubs against the vaginal entrance, causing discomfort, and sometimes pain (O'Hara 1999, Bensley 2001). Far from making sex better for women, circumcision decreases female satisfaction.
The foreskin contains several special structures that increase sexual pleasure, including the frenulum and ridged band (the end of the foreskin where it becomes internal), both of which are removed in circumcision. The LEAST sensitive parts of the foreskin are more sensitive than the MOST sensitive parts of the circumcised penis (Sorrells 2007). In other words, if you wanted to decrease a penis' sensitivity the most, circumcision would be the ideal surgery. The foreskin has nerves called fine-touch receptors which are clustered in the ridged band (Cold 1999). This type of nerve is also found in the lips and fingertips. To get an idea of the sensation these nerves provide, try this experiment: first lightly stroke your fingertip over the back of the other hand. Now stroke your fingertip over the palm of your hand. Feel the difference? That is the kind of sensation the foreskin provides, and the circumcised man is missing.