Having experienced sex with , then without and now with some foreskin again,
I think I can say that possessing foreskin does not add anything noticeable to my pleasure either during masturbation or copulation! On the other hand, my frenulum is so sensitive that I would never choose to be without it!
I know something now that I wish I had known before I was cut! A tight foreskin can be made looser by stretching exercises or by surgical perforation. Simply loosening the foreskin seems far more desirable/less invasive to me than removing it!