Most circumcised male foreskins are fairly mobile when the penis is erect, but may be too tight to slide up to, or around the head of the penis. That’s one major difference in understanding pleasure principle differentials between cut and uncut men. Uncircumcised men have a “turtleneck” of skin richly endowed with nerve endings inside a thin, slippery mucosal layer that covers the unerect penis and slides back to reveal the tip when the member is at fill tilt, so to speak. This layer of skin can be pretty movable and slidey at most stages of arousal, and is basically the uncut penis’ own pre-loaded sex toy.
It’s those nerve endings that everyone’s wondering about. While working at a sex toy store, selling sex toys for boys and condoms alike, I’d routinely get questions about what sex toys might be better or more fun for uncircumcised men, and what condoms were recommended for those with intact foreskins. The overview of advice and recommendations we’d give was that because the head of the uncircumcised penis is often described as more sensitive than the shaft, some toys might feel more intense.
I myself recently penned an ode to uncircumcised cocks for Jewcy.