Mechanical Functions of the Foreskin:

• Protects an infant’s glans from feces and ammonia.

• Shields the glans from abrasion from diapers and clothing, 

• Keeps the glans soft with smegma, an oily substance under the foreskin.

• In his first months, the foreskin functions as a one-way valve, preventing entry of contaminants but allowing passage of urine.

Sexual Functions of the Foreskin:

• Stokes sexual sensations during sexual intercourse when sliding up and down the shaft, by alternately covering and exposing the glans, which allows nerves time to fire and reset.

• This occurs during masturbation or intercourse. After penetration, the foreskin provides a gliding action that significantly reduces friction.

•  Lubricates with smegma during intercourse.

• Provides a vaginal seal that retains a woman’s sexual fluids during intercourse.

• Contains most of a man’s erotic nerve receptors.

• Stimulates a female partner during intercourse.

• Makes the penis look longer and thicker.

Biochemical Functions of the Foreskin:

• Produces antibacterial and antiviral proteins such as lysozyme.

• Contains fibroblast cells that promote wound healing.

• Contains epithelial Langerhans cells, an immune system component.

• Secretes immunoglobulins, which are antibodies against infection.

• Might emit pheromones (gases that are sexual attractants).

     (provided by Kenneth S Lipman)

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