The foreskin produces a cheese - like substance called smegma, which must be washed away daily for good hygiene. (dadsadventure.com)
Teen boys get a bit more smegma to heal / mosturize after masturbation or sex. (ecochildsplay.com)
Many epidemiologists think that male circumcision reduces the risk of cervical cancer by preventing a woman's contact with smegma — goop that can accumulate under the foreskin. (discovermagazine.com)