foreskin
The innervated layer of skin and thin muscle which covers the glans penis. In Japan, there is a stigma against the foreskin covering the head of the penis in adult men, so most penises depicted on Danbooru have retracted foreskins, and ones with the foreskin prominent are relatively rare.
See also
The following tags are aliased to this tag: uncircumcised (learn more).
The following tags implicate this tag: phimosis (learn more).
