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Wikify keratinization.
}}</ref> When the foreskin glides, all of the skin of the penis moves, so stimulation occurs over the whole length of the penis.
Removal of the foreskin results in [[keratinization ]] or callousing of the [[glans penis]] because of chafing and abrasion from clothing, leading to loss of sensation. Removal of the foreskin can lead to trauma of the penis (friction irritation) during [[masturbation]] due to the loss of the gliding action of the foreskin and greater friction, requiring the need of artificial lubrication. During sex, the loss of gliding action is also thought to cause pain, dryness and trauma of the [[vagina]].<ref name="warren-bigelow"/> The trauma and abrasions of the vagina can lead to easier entry of sexually transmitted diseases.<ref name="Bullough2014">{{REFbook
|last=Vern L. Bullough; Bonnie Bullough
|first=