Circumcision desensitizes: Circumcision desensitizes the penis radically. Foreskin amputation means severing the rich nerve network and all the nerve receptors in the foreskin itself. Circumcision almost always damages or destroys the frenulum. The loss of the protective foreskin desensitizes the glans. Because the membrane covering the permanently externalized glans is now subjected to constant abrasion and irritation, it keratinizes, becoming dry and tough. The nerve endings in the glans, which in the intact penis are just beneath the surface of the mucous membrane, are now buried by successive layers of keratinization. The denuded glans takes on a dull, grayish, sclerotic appearance.
Circumcision disables: The amputation of so much penile skin permanently immobilizes whatever skin remains, preventing it from gliding freely over the shaft and glans. This loss of mobility destroys the mechanism by which the glans is normally stimulated. When the circumcised penis becomes erect, the immobilized remaining skin is stretched, sometimes so tightly that not enough skin is left to cover the erect shaft. Hair-bearing skin from the groin and scrotum is often pulled onto the shaft, where hair is not normally found. The surgically externalized mucous membrane of the glans has no sebaceous glands. Without the protection and emollients of the foreskin, it dries out, making it susceptible to cracking and bleeding."
