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}}</ref> The vagina allows for sexual intercourse and birth.
The vagina receives the [[penis]] during sexual intercourse. To accommodate smoother penetration of the vagina during sexual intercourse or other sexual activity, vaginal moisture increases during sexual arousal in human females. This increase in moisture provides vaginal lubrication, which reduces friction. The texture of the vaginal walls creates friction for the penis during sexual intercourse and stimulates it toward [[ejaculation]], enabling fertilization.
==History==
Knowledge of the overwhelming superiority of the [[intact]], [[foreskinned]] [[penis]] over the [[circumcised]] penis in assuring the pleasure and orgasm of the female partner is of long standing. Rabbi Isaac ben Yedaiah, who lived in Southern France in the late 13th century, wrote effusively of the pleasures that the foreskin provided to the woman. Marc Saperstein (1980) provided a translation:
The authors reported:
<blockquote>
When the anatomically complete [[penis ]] thrusts in the vagina, it does not slide, but rather glides on its own 'bedding' of movable [[skin]], in much the same way that a turtle's neck glides in and out of the folder layers of [[skin]] surrounding it. The underlying corpus cavernosa and corpus spongiosum slide within the [[penile skin]], while the [[skin]] juxtaposed agaist the vaginal wall moves very little. This sheath-within-a-sheath alignment allows penile movement, and vaginal and penile stimulation, with minimal friction or loss of secretions. When the penile shaft is withdrawn slightly from the vagina, the [[foreskin ]] bunches up behind the corona in a manner that allows the tip of the foreskin which contains the highest density of fine-touch neuroreceptors in the penis to contact the corona of the glans which has the highest concentration of fine-touch receptors on the glans. This intense stimulation discourages the penile shaft from further withdrawal, explaining the short thrusting style that women noted in their unaltered partners.<ref name="ohara1999" />
</blockquote>
The authors explained the loss of vaginal lubrication:
<blockquote>
As stated, circumcision removes 33-50% of the [[penile skin]]. With this [[skin]] missing, there is less tissue for the swollen corpus cavernosa and corpus spongiosum to slide against. Instead the [[skin]] of the [[circumcised ]] penis rubs against the vaginal wall, increasing friction, abrasion and the need for artificial lubrication. Because of the tight [[penile skin]], the corona of the glans, which is configured as a one-way valve pulls the vaginal secretions from the vagina when the shaft is withdrawn.<ref name="ohara1999" />
</blockquote>