Thus, the glans is best stimulated to feel pleasure by a rolling massage action. With an ample and highly mobile skin system that rolls over the glans with pressure from the opposing surface, this optimal stimulation of the glans is achieved while avoiding direct friction of the delicate glans surface. Direct friction tends to fire off pain receptors causing irritation and also causes further keratinization of the glans. With the skin system of the penis significantly reduced by circumcision, the mobility is essentially gone and now the penis is a static mass with no dynamic self stimulation mechanism. Now, it must be rubbed.
Direct friction is now the primary form of stimulation.
So then circumcision further reduces erogenous sensitivity in the penis by reducing skin mobility and thus the ability to use the foreskin to massage the glans. The combination of foreskin and glans in concert results in an even higher level of stimulation which is unknown to the circumcised male. Circumcision of an infant male significantly reduces erogenous pleasure potential in his penis when he becomes sexually active and continues to be reduced as he ages until, in many cases, he is left with relatively little sensation. A common misperception is that infant circumcision is preferable to adult circumcision because it spares a man pain and trauma. Many physicians however say the opposite and critics admit that most of their objections to infant circumcision cannot be applied to the adult procedure.