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This article is from the Impotence FAQ, by Sine Nomine llama@drizzle.com with numerous contributions by others.
It constricts the base of the penis, preventing blood from flowing
back out of the corpora cavernosa. If you filled a water balloon with
water until it was rigid and then just let go of it, the water would
leak back out and the balloon would collapse. If you fill the balloon
and then fasten a rubber band around the base, the water stays in and
the balloon stays rigid. Cock rings work on the same principle as the
rubber band.
 
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