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A O'Farrell et al. (2008) reported a longer [[foreskin]] improves wetness in the [[preputial sac]].<ref name="ofarrell2008">{{REFjournal
→Characteristics of longer foreskins
Longer foreskins are much less likely to spontaneously retract. The longest foreskins, if manually retracted, are likely to glide forward to recover and protect the [[glans penis]] when released.
|last=O'Farrell
|first=
|DOI=10.1258/ijsa.2008.008106
|accessdate=2025-07-04
}}</ref> Fleiss, Hodges & Van Howe (1998) reported the presence of cathepsin B, lysosyme, chymotrypsin, neutrophil elastase, and cytokine in the sub-preputial moisture.<ref name="fleiss1998">{{FleissP HodgesF VanHoweRS 1998}}</ref> These substances have a destructive lytic effect on pathogens and make the [[preputial sac ]] a trap for disease-causing organisms.
Men with the longest foreskins are able to glide the [[foreskin]] without exposing the [[glans penis]].<ref>* {{REFweb
An unusually long foreskin may be given the term [[Acroposthion#Macroposthia| macroposthia]].
==Lengthening the foreskin==
The [[foreskin]] is responsive to [[tissue expansion]] techniques, as mentioned above, so [[intact]] men who desire a longer foreskin may gradually lengthen their [[foreskin]]. The process involves the use of [[stretching]] to induce [[mitosis]], which gradually increases the quantity of foreskin. The process is slow, but once it is done, it will last the rest of one's life.