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→Intact penis: Revise text.
|date=2007-03
|accessdate=2020-02-18
}}</ref> [[Intact]] males simply use their hand to glide the [[foreskin ]] back and forth. It is ''not'' necessary to retract the [[foreskin]] while masturbating. If the foreskin is of adequate length, then the [[intact ]] male will usually keep it forward for additional stimulation. Use of lubrication is optional for intact malesKeeping the head covered by the foreskin protects the sensitive head. The motion of the foreskin stimulates the nerves inside the foreskin. Use of lubrication is optional for intact males.
Prolonged and/or vigorous masturbation occasionally causes [[lymphoedema]] of the foreskin, which causes swelling of the foreskin. The condition is painless and harmless. It usually resolves within about 24 hours.