Very good catch. I forgot to mention that you need to put a condom over your cock to cover the electrode ring just under the head. This then ensures the electrodes do not touch each other.

I stumbled across this set up that has given me multiple super prostate orgasms lasting as long as I can stand it. Very simple placement of electrodes for this. One metal ring at base of head. Connection is on dorsal side with about 1/3 of the ring insulated with electrical tape on this side. Other ...