Changes

| last=Fleiss

| first=Paul M

| title=Immunological functions of the human prepuce

| journal=Sex Trans Inf

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.

{{SEEALSO}}