Changes

The outer surface of the [[foreskin ]] is specialized to detect feather-light touch and other sensations, including painful ones. The infamous zipper injury is an extreme example of the sort of damage the outer [[skin]] was designed to detect and prevent, long before the zipper posed a threat to the uninitiated.

Compared with the true (outer) [[skin]] of the [[foreskin]], the [[glans ]] is only feebly sensitive to light touch, pain, heat and cold. This is part of the reason we call the foreskin the primary sensory tissue of the [[penis]]. Without the [[foreskin]], the end of the [[penis ]] is numb to a host of sensations that tell the owner whether one of his most prized organs is in good company, or should move to safety.