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→Erection functions: Add text and Wikify.
The human race evolved over perhaps 700 millenia. The foreskin evolved its physiological functions that improve fitness for survival during that time.<ref>{{URLwikipedia|Evolution|Evolution}}</ref>
=== Erection functions ===
When [[erection]] of the [[penis]] occurs, it the penis also expands in sizeand length, so more skin is needed to cover it and allow painless erection. The foreskin unfolds to provide additional skin and permit permits [[intact]] men to enjoy painless erection, unlike many [[circumcised]] men who experience very tight, painful skin when [[erection]] occurs.
=== Protective functions ===