Cock rings must not be used without medical advice by those who have cardiovascular problems or who take blood-thinning medication. The gel also makes it easier for the ring to slide off the pump, and later, to remove it from the penis. Today, cock rings can be bought with accessories that stimulate the clitoris or anal area during intercourse. Also, look out for this icon to see what offers come from international shops. This may lead to temporary or permanent nerve damage.