The foreskin has many functions such as –

• Protection
  The Foreskin protects the glans much like the eyelid protects the eyeball. It keeps the glans warm, moist and maintains the PH balance. The foreskin will protect the entire penis when accidents happen, such as contusions, abrasions, lacerations, and burns. The foreskin is the first layer – a double layer – of defence from injury to the rest of the penis.
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• Self-Cleaning Functions
  The intact penis is naturally clean.
  Every time a genitally intact male urinates, the urine stream flushes out the urethra and foreskin of foreign microbes that may have strayed inside. In healthy individuals, urine is sterile and has a disinfectant quality. Researchers have demonstrated that the swirling action of urine as it rushes through the foreskin flushes it out effortlessly and naturally. This function is especially efficient when the foreskin is long and the preputial orifice is narrow.Therefore, you never need to worry about the foreskin being ‘unclean.’
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• Self-Protecting Functions
  The urinary meatus (the opening of the glans through which urine and semen flow), is an entry point into the body.
  From infancy to adulthood, the foreskin ensures optimal protection of the glans and urinary meatus from contaminants of all kinds.
  During childhood, the foreskin is also usually firmly attached to the glans to prevent contaminants from invading the urethra.
  The neck of the foreskin places the vulnerable urinary meatus at a distance from the external environment and defends it against invading contaminants. The fusion of the foreskin and glans and the nonexpandability of the preputial orifice in the child’s penis are therefore necessary for the health of the child. Even after the foreskin separates from the glans and becomes retractable, it continues throughout life to cover the glans and meatus in order to protect these delicate structures from dirty, contamination, abrasion, or bacterial invasion.
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• Immunological Protection
  The mucous membranes that line all body orifaces are the body’s first line of immunological defense. Glands in the foreskin produce antibacterial and antiviral proteins such as lysozyme. Lysozyme is also found in tears and mother’s milk. Specialized epithelial Langerhans cells, an immune system component, aboud in the foreskin’s outer surface. Plasma cells in the foreskin’s mucosal lining secrete immunoglobulin’s, antibodies that defend against infection.Rigorously controlled studies have also demonstrated that the foreskin plays a protective role in shielding the rest of the penis and thus the rest of the body from the contagion of common sexually transmitted diseases (STDs) encountered during sexual activity. Apocrine glands are important glands found in the skin. They are found in the foreskin and elsewhere on the body. They secrete the important lysosomal enzymes cathepsin B, lysozyme, chymotrypsin, and neutrophil elastase. All of these enzymes help protect the body from many kinds of bacteria. These enzymes are also found in tears and other bodily fluids. Human apocrine glands also produce cytokine, a nonantibody protein that generates an immune response on contact with specific antigens. All these substances have immunological functions and protect the penis from viral and bacterial pathogens. This natural protective function has been destroyed in circumcised males.
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• Antibacterial Function
  To help fight harmful bacteria, the foreskin supports a rich flora of beneficial bacteria. Friendly bacteria exist in a symbiotic relationship with the body and are found on all body surfaces and through the gastrointestinal, genitourinary tract (the urinary system that runs from the kidneys, through the bladder, and out the penis), and the mouth. Friendly bacteria also thrive in the eyes. Without the presence of friendly bacteria, the human body would be vulnerable to attack from pathogenic bacteria.The good bacteria that live in the inside of the foreskin are similar to the bacteria found in the mouth, nose, the female genitals, and the skin in general. It must be stressed that this good bacteria is both harmless and highly beneficial. Without these friendly bacteria, the urethra would become an easy entry point for germs and harmful stains of bacteria, which could cause disease.
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• Coverage During Erection
  During erection, the penile shaft becomes thicker and longer. In some males, the penis can extend to twice its flaccid length. Sometimes, it can become even longer. The double-layered foreskin provides exactly the right amount of skin necessary to accommodate the expanded organ and to allow the penile skin to glide freely, smoothly, and pleasurably over the shaft and glans.It is important to consider the fact that every penis is unique. By looking at an infant’s penis, it is impossible to predict how big his penis will become when he is an adult. What we can say with certainty is that your baby’s penis will develop and mature according to his own unique genetic coding. Thus, the amount of foreskin he is born with is exactly the amount he will need for his penis to develop properly and experience comfortable, pleasurable erections throughout life. As a result, the idea that any amount of penile skin can be cut off without affecting the later function of the penis is false. Everything provided is required.During full erection, the sensitive inner sleeve of the foreskin is turned inside out, exposing it. In this position it receives and transmits pleasurable sensations. The natural penis is a marvellously engineered organ for receiving and giving natural pleasure.Needless to say, circumcision destroys all these functions and imposes a diminished, scarred, immobile, dowel-like penis that has permanently lost the ability to experience normal levels of sexual sensations. A circumcised male, or his partner, for that matter, can never know the intimacy of the natural penis and the ability of the foreskin to open and glide up and down the shaft. An entire dimension of sexuality has been lost to both the male and his sexual partner.
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• Erogenous Sensitivity
  The foreskin is more sensitive than the fingertips, the glans (head) of the penis, or the lips of the mouth. It contains a richer variety and greater concentration of specialized nerve receptors than any other part of the body. These specialized nerve endings can discern motion, subtle changes in temperature, and fine gradations of texture. This function enables genitally intact males to experience a superior dimension of sexual pleasure, compared to males who were circumcised. Intact males can be tender, gentle, relaxed, and loving during sex because the slightest and subtlest gesture or motion evokes deeply satisfying sensations. Circumcised males have to work harder just to feel sensations. This is an unhealthy situation for both the male and his partner.
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• Self-Stimulating Sexual Functions
  The intact penis has moving parts. The foreskin’s double-layered sheath enables the penile shaft skin to glide back and forth over the penile shaft. The foreskin can usually be slipped all the way, or almost all the way, back to the base of the penis, and also slipped forward beyond the glans. This wide range of motion stimulates the orgasmic triggers in the foreskin, frenulum, and glans.This is the natural way that the penis is erotically stimulated. The movement of the foreskin over the glans and the pressure of the glans pressing against the foreskin is pleasurable. Sadly, males circumcised at birth can never imagine the pleasure of this natural sensation.In the natural penis, the foreskin is the most important source of erotogenic, orgasm-inducing sensations. As we learned in the previous chapter, the foreskin contains a highly organized erotogenic sensory nerve-receptor system. It transmits special sexual sensations to the central nervous system and brain. The glans also has erotogenic sensory nerve receptors along its rim (the corona glandis), but far fewer than the foreskin. The massaging action of the foreskin against the glans produces sexual stimulation in both organs – something else that the circumcised male will never experience.Some genitally intact males can even stimulate themselves to orgasm without touching their penis. They simply clench the groin muscles that help fill the penis with blood. Each voluntary contraction of the muscles forces more blood into the erectile tissues. This causes the shaft and glans to engorge even further and pushes the glans through the lips of the foreskin. Each dilation of the lips of the foreskin stimulates the specialized nerve receptors in the foreskin. In addition, the tension exerted on the foreskin stimulates the nerve receptors in the glans. The resulting sensation can lead to orgasm. A circumcised male would never be able to accomplish this natural feat.
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• The Foreskin Enhances Forepleasure
  Forepleasure is the pleasurable stimulation of the genitals with or without the intention of eliciting orgasm. Forepleasure takes place during foreplay. Forepleasure of the penis stimulates the brain to release beneficial and health-giving hormones into the bloodstream. These hormones improve overall bodily health, improve the emotional state, and can even reduce pain in any part of the body. Forepleasure, as the name implies, feels great.
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• Sexual Functions of the Foreskin During Intercourse
  One of the foreskin’s functions is to facilitate smooth, gentle, and slow movement between the two partners during intercourse. The foreskin enables the penis to slip in and out of the vagina nonabrasively inside its own slick sheath of self-lubricating, movable skin. The female is thus stimulated by moving pressure rather than by friction only, as when the males’ foreskin is missing.
  The foreskin fosters intimacy between the two partners by enveloping the glans and maintaining it as an internal organ. The sexual experience is enhanced when the foreskin slips back to allow the male’s internal organ, the glans, to meet the female’s internal organ – a moment of supreme intimacy and beauty.You may have heard circumcision promoters allege that the foreskin is ‘dangerously thin and delicate; and that it ‘rips and tears easily during intercourse.’ This is unscientific nonsense and has no basis in anatomical fact. I am sorry to say that it is a deception calculated to provide false reassurance to anxious circumcised males and to frighten parents into letting their children be circumcised. The simple truth is that the foreskin is perfectly designed to function effortlessly and pleasurably during sexual activity. Its double-layered integument is strong, flexible, and resilient.The foreskin is a durable and vigorous organ that enhances and facilitates sexual intercourse. If it didn’t, it would have atrophied years ago.
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• Self-Lubricating Function
  The glans itself contains no sebaceous glands and relies on the foreskin for production and distribution of sebum to maintain proper epithelial lubrication. Lubrication is naturally secreted by Cowper’s glands in the urethra. This clear fluid begins to flow out of the meatus as the male becomes sexually aroused.During intercourse, this natural lubricant assists the male in inserting the penis in to the vagina. Because the fluid is sheltered under the foreskin of the erect penis it is less likely to dry up. Instead, it keeps the penis well lubricated and prevents the vagina from drying out.
  In the circumcised penis, the Cowper’s gland fluid quickly evaporates. When the circumcised male inserts his dry penis into the vagina, it soon uses up all the female’s natural lubricants, causing friction and pain for both partners. This can lead to small tears and painful bleeding in the organs of both partners.Many circumcised men will think they are normal because they are able to function sexually to their satisfaction, never realizing that their sexual functioning as an adult was changed forever by a medically unnecessary and extremely painful procedure done to them as an infant.
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Production, Retention and Dispersal of Pheromones

The sense of smell is one of the oldest, most precise, and most important senses in humans. Smells convey vital information to the brain. Pheromones are hormonal chemical messengers secreted by an individual and perceived by another individual of the same species. They create sexual arousal and attraction in the person perceiving the pheromone. These glands are found in the armpits, breasts, and in the genital area. The penis itself is a specific site for these glands. Pheromones are secreted by the apocrine glands in the foreskin. These glands are present at birth, but during puberty they develop in the presence of testosterone.Although pheromones themselves are odourless, they are released by the foreskin into the air where they are perceived by the vomeronasal organ, a small tubular structure in the mucosa of the nasal septum. This organ is a component of the accessory olfactory system. The olfactory area of the cerebral cortex is closely associated with the limbic system, the part of the brain that organizes emotional responses, mood, memory, and sexual arousal. Although most complex smells and their emotional associations are learned, the identification of pheromones is hardwired into the brain. The automatic sexual arousal elicited by the perception of pheromones is as certain as the automatic pleasure reflex elicited by a caress.

 

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References

For further reading and to find out more go to- http://www.drmomma.org/2009/09/functions-of-foreskin-purposes-of.html

Credit also go to www.drmomma.org for this information.