I was looking through a reproduction of the 1919 Sears catalog and found two or three pages advertising Electric Belts; lots of lightning bolts radiating from disks around the belt. All of them had a hanging dingus that was obviously supposed to be attached to nether regions. The more expensive the belt , the larger and more numerous the electrode disks. The method of operation wasn't given but I suspect that a drycell supplied interrupted current to a Model-A type 'ignition' coil. That would light you up
Also advertised was genuine Coca Cola ; all sorts of 'coke' drugs... you name it.
-A world before regulation of patent medicines and gizmos "for shore."
We live in sanitized times.