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).
Circumcision destroys this whole extraordinary structure and function. It always removes most of the nerve-packed ridged band, and often all of it.
Videos (flv) of a real foreskin being retracted in a similar way (NSFW: Scroll down to view)
Thanks to Richi for providing these.
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