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Wikify gliding action.
|DOI=10.1016/s0306-9877(02)00250-5
|accessdate=2020-01-04
}}</ref>, so the lack of the foreskin makes penetration more difficult. The [[gliding action ]] of the foreskin reduces friction and abrasion, while conserving vaginal lubrication,<ref name="warren-bigelow1994">{{REFjournal
|last=Warren
|first=John