Jay wrote Is the crusty looking keratinization what causes cut guys to feel less pleasure? How can that be comfortable for a woman?
Keratinization is a factor, but far from the only one. I think of it as like kissing with chapped lips.
The foreskin's nerve endings specialize in stretch-and-release. Also like the nerve endings in the lips. So the push-and-pull of intercourse, masturbation, oral sex stimulate that special feel and give a whole new dimension to enjoyment. LIke someone said, it's the difference between seeing in color vs. black-and-white.
And no, it's not comfortable for a typical woman. I've noted elsewhere that my ex was married to a circumcised man, and in contrast to me, she said she just wanted sex to be over with him.