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|DOI=10.1046/j.1464-410X.1996.85023.x
|accessdate=2019-10-14
}}</ref> he The two foreskin layers provide a skin reserve. When the penis becomes erect, the foreskin may wholly or partially unfold to provide the necesssary skin to allow for expansion of the penis during erection.
The foreskin is the movable part of the penis. The foreskin is not attached to the underlying structure and is free to glide back and forth.<ref name="lakshmanan-prakash1980">{{REFjournal
}}</ref>
The layer of [[dartos ]] muscle is contained within the foreskin. <ref name="cold-taylor1999 /> The [[dartos]] muscle keeps the foreskin snugly against the glans. The fibers of the dartos muscle form a whorl at the tip that functions as a sphincter. The sphincter opens to allow urine to flow out, but closes to protect the penis from foreign matter, contaminants, and pathogens.<ref name="lakshmanan-prakash1980"/><ref>{{REFjournal
|last=Jefferson
|first=