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→Foreskin in adulthood: Wikify.
The adult foreskin measures about 3 inches by 5 inches or [[The Foreskin: 15 Square Inches of Erogenous Tissue| 15 square inches]].<ref name="taylor1996">{{TaylorJR LockwoodAP TaylorAJ 1996}}</ref> The foreskin creates the [[preputial sac]]. The two foreskin layers provide a [[skin]] reserve. When the penis becomes erect, the foreskin may wholly or partially unfold to provide the necessary [[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 [[gliding action| glide back and forth]].<ref name="lakshmanan-prakash1980">{{REFjournal
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