The main sensitive bit is the the glans.
The foreskin is not particularly sensitive... I mean... it's more sensitive than my back or elbow for sure (and I'm sure that there's nerve endings), but not sensitive like the protected skin underneath. Unless it's caught in a zip... that hurts for sure.
I think... that for sex - both the shaft and glans need to be stimulated. For me. That's my quick summary ok.
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