One of the best hands free sex toys for couples but we must bring to attention that if the man is too sensitive on the penis then these may be found to be aggravating. If this is the case, shop for a single vibrating cock ring that won't be as powerful, alternatively you can turn down the power to allow the woman to enjoy this interesting effect.
Ladies love these and for good reason, it's a very subtle addition but the discreet vibration is usually thought to be a precursor to more direct adult toys like vibrators that can give an orgasm. A great starting point for the squeamish partner, there is rarely a person who won't agree to giving one of these a try.