How the Foreskin Works
This shows a man's foreskin being retracted passively, as for cleaning. The action in erection and intercourse is similar (without the wrinkling).
Videos (avi) of a real foreskin being retracted in a similar way, side-on and end-on (NSFW). Thanks to Richi for providing these.
Circumcision destroys this whole extraordinary structure and function. It always removes most of the nerve-packed ridged band, and often all of it.
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