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How does an erectile dysfunction ring work? An erectile dysfunction ring helps a man maintain an erection for intercourse. Worn at the base of the penis, the ring works by constricting the blood flow out of the penis (while allowing blood to continue to flow in). This keeps the blood in the penis and therefore maintains an erection. A ring can be used by itself, for a male who is able to achieve an erection briefly, or in conjunction with a penis pump, if the man is unable to achieve an erection. Use of the ring in d with the penis pump may be useful during the recovery period after prostate surgery.