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}}</ref> so it cannot be [[Infection| infected]]. The preputial sac will remain closed for a variable number of years.
The preputial sac is lined with [[mucosa]] as is appropriate for an internal organ where moisture is present.<ref name="cold-taylor1999">{{ColdCJ TaylorJR 1999}}</ref> [[Urine ]] and other sources of moisture are not harmful to it.
The [[glans penis]] (head of the [[penis]]) is covered and protected from friction and abrasion by the [[foreskin]] while it is in the preputial sac, so it does not accumulate [[keratin]], and maintains its [[Foreskin sensitivity| natural sensitivity]].
}}</ref> Moistness also may be maintained by [[transudation]].<ref name="cold-taylor1999" /> The sac may vary from very slightly moist to wet.
A longer [[prepuce ]] helps to keep out contaminants and pathogens. Lakshmanan & Parkash (1980) described the muscle fibers in the [[prepuce]] (known as the [[dartos]]), which contract to keep the prepuce snugly close to the [[glans penis]].<ref>{{REFjournal
|last=Lakshmanan
|first=