To say that circumcision has no effect on sexual pleasure or function is to be dishonest about how the penis works, or neurology, for that matter. Indeed, removing such an extensive amount of penile nerve feedback can cause a number of problems, from erectile dysfunction to premature ejaculation, which are more common among circumcised men, and which can develop in men after circumcision. Other problems include tingling, numbness, a significant decrease in sexual sensation, and even debilitatingly painful over-sensitivity. Results vary because the cause involves destroying and damaging complex, densely-innervated structures, the remainder of which must then heal and re-wire themselves to the brain in one fashion or another.