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}}</ref>  Several people have argued that the gliding movement of the foreskin is important during sexual intercourse. Warren & Bigelow (1994) state that gliding action would help to reduce the effects of vaginal dryness and that restoration of the gliding action is an important advantage of [[foreskin restoration]].<ref name="warren-bigelow">{{REFjournal

}}</ref> [[Kristen O'Hara|O'Hara]] (2002) describes the gliding action, stating that it reduces friction during [[sexual intercourse]], and suggesting that it adds "immeasurably to the comfort and pleasure of both parties".<ref>{{REFbook

}}</ref>  It is argued that removal of the foreskin results in a thickening of the glans 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

}}</ref>  One study showed that the loss of the foreskin resulted in decreased masturbatory pleasure and sexual enjoyment.<ref name='KimPang2007'>{{REFjournal