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→Intact penis: Wikify.
|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 males. The motion of the foreskin stimulates the nerves inside the foreskin.
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.