Circumcision is very popular in the U.S.A. and by Jews and Muslims. It is a mutilation of the male body. It takes away a lot of pleasure from man and a circumcised cock hurts a girl. Not only but, as Kami said, especially in anal.
Fortunately you don't find many circumcised guys in the rest of the world and we don't have any sanitary issues with our foreskin.
The human body is beautiful as it is. We don't need to add anything or cut pieces away.
Steve Holmes