I just recently saw a video where man put two rings around his penis that were apparently electrically conductive, turned on some sort of a device that was off camera, and in just a short time he was orgasming. He seemed to enjoy it. This is apparently called e-stim. The devices apparently use a nine volt battery, and are quite expensive. Has anyone ever had any experience with this type of stimulation? Is it safe? What does it feel like? It looks like it could be interesting.