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TENS units work on 2 levels: the electrical current keeps the nerves busy, confusing them so you can't feel as much pain, and to relax a muscle in spasm. You also need to keep the TENS pads away from your spine, not just your heart. I have a TENS unit for my back, but have never used it for sexual stimulation. The thought has crossed my mind, I admit, but you can get an uncomfortable short if the pads aren't stuck fully to the skin, so I think you'd have to be fairly closely shaved to put it on your lady bits and not get zapped. I am not closely shaved, and have done enough electrical work (and forgotten if I'd turned off the power or not) that getting zapped doesn't really appeal to me, so that was kind of end-of-story for me.
Basically, you get a control unit and pads, and you can turn it on as low or as high as you can stand, so you're in control. I suspect, though, going too high for too long might have a numbing effect, like a vibrator (at least, that's what vibes do to me). Not long term, I mean, but if you're looking to be stimulated, I think the current could eventually stop giving you the effect you want. That certainly happens on my back muscles...eventually, you stop feeling it, so you have to turn it up. I don't know what the effect of that much current on such sensitive body parts would be, I think it could be problematic.
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