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→Urination: Revise text and add citation.
== Urination==
[[Intact]] men sometimes ask, "do I have to retract my [[foreskin]] when I pee?" They may have been heard myths that it is unhealthy to have [[urine]] inside the [[foreskin]], however there is no factual basis for that claim. Urine is normally sterile has a healthy microbiome<ref name="cold-taylor1999" /> when it leaves the urethra and is helpful for flushing out the [[foreskin]] and keeping it clean. Boys by necessity pee through their [[foreskin]] because it does not retract and men with [[phimosis]] also pee through their foreskin because the foreskin does not retract. It does no harm so it is not necessary to pull back when you pee.
Everything in the preputial sac is covered with [[Mucosa| mucosal membrane]] (similar to the inside of your mouth), which likes to be wet, so no damage or threat to health is caused by having urine inside the [[foreskin]]. The sphincter action of the preputial orifice functions as a one way valve, blocking the entry of contaminants and pathogens while allowing the passage of urine.<ref name="fleiss1998" /> The [[urine ]]will help to flush contaminants and pathogens out of the [[foreskin]]. Some individuals may experience [[ballooning of the foreskin]], which is harmless.