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|DOI=10.1046/j.1464-410X.1996.85023.x
|accessdate=2019-10-14
}}</ref> he 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