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→Anatomy and function of the foreskin in detail
The two foreskin layers provide a skin reserve, into which the growing shaft expands during an erection. Depending to the individual length of a man's foreskin, it thereby retracts more or less far. In some men, the foreskin still fully covers the glans during an erection, in others the glans is partly or completely exposed.
In addition, the foreskin, in combination with the shaft skin, allows a natural gliding action. During intercourse as well as masturbation the outer skin is in contact with the vagina or the hand respectively. The penile shaft moves mostly within its skin and the skin only moves at the end of its thrust. Due to this, the friction with the vagina or hand is reduced. The sexual stimulation mostly occurs through the stretching and movement of the foreskin, when it is pulled over the glans and back, as well as the direct stimulation of the inner foreskin when it is exposed and comes into direct contact with the vagina or the hand. The [[frenulum of the foreskin]] may limit retraction.
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