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Few parts of the human anatomy can compare to the incredibly multifaceted nature of the human foreskin. At times dismissed as “just skin,” the adult foreskin is, in fact, a highly vascularized and densely innervated bilayer tissue, with a surface area of up to 90 cm, and potentially larger. On average, the foreskin accounts for 51% of the total length of the penile shaft skin and serves a multitude of functions. The tissue is highly dynamic and biomechanically functions like a roller bearing; during intercourse, the foreskin “unfolds” and glides as abrasive friction is reduced and lubricating fluids are retained. The sensitive foreskin is considered to be the primary erogenous zone of the male [[penis]] and is divided into four subsections: [[Preputial mucosa| inner mucosa]], [[ridged band]], [[frenulum]], and outer foreskin; each section contributes to a vast spectrum of sensory pleasure through the [[gliding action]] of the foreskin, which mechanically stretches and stimulates the densely packed corpuscular receptors. Specialized immunological properties should be noted by the presence of Langerhans cells and other lytic materials, which defend against common microbes, and there is robust evidence supporting [[HIV]] protection. The [[glans penis| glans]] and inner [[mucosa ]] are physically protected against external irritation and contaminants while maintaining a healthy, moist surface. The foreskin is also immensely vascularized and acts as a conduit for essential blood vessels within the penis, such as supplying the glans via the frenular artery.<ref>{{REFjournal

The foreskin (also known as the prepuce) is the double-layered fold of smooth muscle tissue, blood vessels, neurons, skin, and [[Preputial mucosa| mucous membrane]] part of the penis that covers and protects the [[glans penis]] and the urinary meatus.<ref name="cold-taylor1999"/> The adult foreskin measures about 3 inches by 5 inches or [[The Foreskin: 15 Square Inches of Erogenous Tissue| 15 square inches]].<ref name="taylor1996">{{TaylorJR LockwoodAP TaylorAJ 1996}}</ref> The two foreskin layers provide a skin reserve. When the penis becomes erect, the foreskin may wholly or partially unfold to provide the necessary skin to allow for expansion of the penis during erection.

The epithelium of the outer layer of the foreskin is true skin while the epithelium of the inner layer is [[Preputial mucosa| mucosal membrane]]. There is a mucocutaneous boundary at the tip of the foreskin. The mucocutaneous junction is a specific erogenous zone.<ref name="winklemann1959">{{REFjournal

The vascular ridges of the `ridged band' and its [[Meissner's corpuscles]] firmly separate preputial epithelium from true skin and place preputial [[mucosa ]] amongst other mucocutaneous mucosae[[mucosa]]e. Winkelmann emphasized the structural and functional importance of junctional regions of the body and focused on mucocutaneous end-organs, or `genital corpuscles', of the glans penis and prepuce. Some of these end-organs resemble Krause end-bulbs; others resemble [[Meissner's corpuscles]]. … [[Meissner's corpuscles]] of the prepuce may be compared with similar nerve-endings in the finger-tips and lips, which respond in a fraction of a second to contact with light objects that bring about deformation of their capsules. … The prepuce provides a large and important platform for several nerves and nerve endings. The innervation of the outer skin of the prepuce is impressive; its sensitivity to light touch and pain are similar to that of the skin of the penis as a whole.<ref name="taylor1996" />

The foreskin provides physical protection to the [[glans penis]] and inner [[mucosa]], supplying moisture and natural oils by [[transudation]], while protecting the mucosal [[mucosa]]l tissue from pathogens, pollutants, friction, injury, [[keratinization]], de-sensitization, and drying out. The foreskin protects the glans penis and meatus of infant boys from abrasion and irritation from ammoniacal diapers.<ref name="gairdner1949">{{GairdnerDM 1949}}</ref> <ref name="dobanavacki2012">{{REFjournal

Nature designed the foreskin to be an [[Foreskin sensitivity| erogenous sensory organ]]. The foreskin has a layer of muscle called the [[dartos]] muscle sheath that provides the foreskin with elasticity, flexibility, and stretchiness, which allows full stimulation of the nerves in the [[ridged band]] that sense movement and stretching to provide [[foreskin sensitivity]]. There is a mucocutaneous region at the tip of the foreskin where outer skin changes to inner [[mucosa]]. Winklemann Winkelmann (1959) identified the foreskin as a ''specific erogenous zone'' (meaning an area of acute erogenous sensation). Winklemann reported rete ridges in the foreskin with nerves set close to the surface with closely set networks.<ref name="winklemann1959"/>