It's the removal of the foreskin. It's not a "sadistic rite," insanity, or a barbaric act. It's a surgical procedure that parents may choose to have their boys undergo for the best interests of the child, or at the recommendation of a doctor.
Circumcision eliminates problems with retracting the foreskin and inflammation of the foreskin. It also may reduce the risk of penile cancer and urinary tract infections. Aside from that, many people don't consider a drooping hunk of skin at the end of a sex organ to be very attractive.
Hygiene is an issue with circumcision. You can see why the hygiene argument might have a basis in circumcision, since the foreskin acts as a storage unit for nasty substances. It doesn't take long for bacteria to multiply and become great in number, and for build-ups to happen. See smegma
Label on a penis: Not circumcised. Wash before and after sex, masturbation, or public display.
Come on, people. Circumcision's a personal point of view. Be happy with what you have. The only "damage" here is that caused by people that tell circumcised males that they _are_ damaged or "mutilated!"
Mutilation: the destruction of something to where it is not nearly what it was or how it used to perform. Well, if circumcision is sexual mutilation, how come America (with the majority of males circumcised) are happy people -- many with children?