Your sex toy tierlist got me thinking, I scored on 17 items but only because I genuinely have no idea where you even FIND the kinds of sex "toys" I want to try, let alone body safe ones, so as a humble small town kinkster I ask: where on EARTH do you find things like catheters and shock devices and how do you use them safely?
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the thing is, with shock devices it depends on what you're looking for. an incomplete list:
E-Stims
TENS units
violet wands
cattle prods
stun guns
Tasers
you can buy these from various places; animal/cow supply stores, dsm supply for TENS, various self defense places for stun guns and tasers, the E-Stim shop which ships, and the violet wand store (though you can get weak ones marketed for hair regrowth from other places)
E-Stims are basically a sex brand of TENS unit that often come with electrified sex toys, like dildos and anal plugs. that website actually has a pretty great set of guides on safety and how-to, so here's the link.
in short, the big concern with electroplay is avoiding running a current through your heart. it's actually for that reason that even though stun guns and tasers are supposed to be safe to use on people, they're a pretty big fuck no for me (here's a video by Adam Savage explaining why)
obviously, you also don't want to shock your eyes, and you generally want to keep things away from your head. the simple way to avoid running a current through the heart is NOT crossing the midline. with a TENS unit, what basically happens is that an electrical current will run between wherever you put the red and black patches on the same line, so make sure the current won't run through the midline in the thoracic region and you're good.
I don't know much about cattle prod usage, but my partner says you start at half strength by taking out two out of four of the batteries, then taking two wooden dowels of the same battery size, covering them with aluminum foil, and putting them in so they conduct, but aren't sending as much strength. that gives a lot of the terror aspect, but not the extreme voltage. if your partner still wants more feeling, you can add batteries in slowly. I'd probably aim for fleshy parts of the body (thighs and butt especially) and avoid joints and the other places that aren't good for impact
violet wands are probably the safest. they're essentially static electricity, so you can't run a current deeper than the surface of the skin. you can use it like a wand and zap your bottom, but you can also use a connector that you either put on the sub or on your skin and zap them with your hands or other implements. (this changes nothing, it just changes who's grounded. if you're concerned about medical equipment like pacemakers, ground the person who doesn't have any or use it like a wand and you're set.) grounding also lets you "turn it off" by just grabbing your sub securely so you two are connected, and restart sensation by pulling away
I hope these answers helped, and feel free to ask other questions