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Cock rings are most often used to make an erect penis harder and bigger, to keep it that way for a longer amount of time, and to delay and heighten orgasm. They work by constricting blood flow and thus keeping blood in the shaft of the penis. When a wearer finally does ejaculate, (if he can with the ring on—some men can’t) the sensation can be more intense since the orgasm was delayed and the penis is filled with additional blood.
eHow Member: DailySexScoop.com