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→Masturbation with foreskin: Add citation.
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Prolonged and/or vigorous masturbation occasionally causes [[lymphoedema]] of the foreskin, which causes temporary swelling of the [[foreskin]]. The condition is painless and harmless. It usually resolves within about 24 hours.<ref>{{REFweb |url=https://www.reddit.com/r/hardflaccidresearch/comments/1k393ff/foreskin_swelling_after_masturbating/ |title=Foreskin swelling after masturbating |last=Ananymous |first= |init= |author-link= |publisher=REDDIT |date=2025-04 |accessdate=2025-05-12}}</ref>
[[Sclerosing lymphangitis]] is a rare condition that is associated with vigorous masturbation.<ref name="rosen2003">{{REFjournal