Originally Posted by CIRP
Value to female partners. The foreskin has long been known to be valuable to the female partner. The presence of the foreskin is reported to be stimulating to the female. Women are more likely to experience vaginal dryness during sex with a circumcised partner. The unnatural dryness may make coitus painful and result in abrasions. The vaginal dryness may be mistakenly attributed to female arousal disorder. O’Hara & O’Hara report that the female partner is less likely to experience orgasm when the foreskin is not present and more likely to experience orgasm or even multiple orgasms when the foreskin is present.
From Foreskin Sexual Function/Circumcision Sexual Dysfunction
I can’t find any numbers but I recall a study claiming that a woman had a 68% higher chance on a orgasm if she had sex with an uncircumsised penis as opposed to a cut one. But I can’t say anything about how solid that study was. It still seems obvious that the foreskin has an effect on the pussy during fucking as it makes up about a quart to a third of a penis that is in the average range. Can’t expect that much loss off mass to go unnoticed.