The Surplus of Intactness Intercourse

[Yunus]

1 of the surpluses of intact intercourse is Gliding Mechanism.
Here is the information :

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During intercourse the loose skin of the intact penis slides up and down the shaft of the penis, stimulating the glans and the sensitive erogenous receptors of the foreskin itself. On the outstroke the glans is partially or completely engulfed by the foreskin. This is known as the `gliding mechanism.'

The gliding mechanism is Nature's intended mechanism of intercourse. As such, it contributes greatly to sexual pleasure. Also, since more of the loose skin of the penis remains inside the vagina, the woman's natural lubrication is not drawn out to evaporate to a great extent, which makes sex easier without using artificial lubricants.

The prepuce is a highly innervated and vascularized genital structure. It is entirely lined with the peripenic muscle sheet. Specialized ecoptic sebaceous glans on the inner preputial surface produce natural emollients and lubricants necessary for normal sexual function. The primary orgasmic triggers are found in the preputial orifice and frenulum. When unfolded, the prepuce is large enough to cover the length and circumference of the erect penis and acts as a natural sheath through which the shaft glides during coitus. Only the presence and functions of the prepuce allow for physiologically normal coitus to occur as designed by nature.
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Source : Fleiss, Paul M; Frederick Hodges. "Nontherapeutic Circumcision Should not be Performed," American Medical News, vol. 38, no. 26 (July 17, 1995): p. 16. & google

[Yunus]

Here is the information about effects of penile reduction surgery (circumcision) on sexual intercourse :

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Although still pleasurable for the man, intercourse without the participation of the prepuce lacks the gliding mechanism. The only source of stimulation is the glans rubbing against the wall of the vagina. The sensations from the specialised receptors of the frenar band, frenulum and inner foreskin layer are missing.

"With intravaginal containment of the normal penis, the male's mobile sheath is placed within the woman's vaginal sheath. It is impossible to imagine a better mechanical arrangement for non-abrasive stimulation of the male and female genitalia than this slick 'sheath within a sheath.' Circumcision destroys this one sheath within a sheath . . . I would hazard a guess, that dyspareunia [painful intercourse] is more common in the women whose husband is circumcised . . . one would be foolish to discount the circumcised male's immobile penile skin sheath as an ancillary item contributing to vaginal, abrasive discomfort . . . The male with a penis already moderately obtunded by circumcision may be less apt to use a condom, which he feels may further decrease his genital sensitivity . . . because most American males lack a facile prepuce, the period of foreplay and dalliance may be abbreviated in the rush to the intra-vaginal method of penile stimulation. Both these factors conceivably could be of significance in increasing the rate of venereal disease, including AIDS . . . "

If the surgery was performed on an infant, by adulthood a relatively thick keratin layer will have formed on the normally skinless mucosal surface of the glans, which further reduces the stimulation. If the circumcision was performed as an adult, the keratin layer will form, and the sensitivity of the glans will gradually be reduced over time.
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Source : Say No to Circumcision! 40 Compelling Reasons Why You Should Respect His Birthright and Leave Your Son Whole (2nd edition), by Thomas A. Ritter, MD, Hourglass Book Publishing 1996 & google

[maxadam]

in short, i came to know that circumcision make penis insensitive up to some level..