I'm sorry to be so late in replying. I've been busy with other matters.
The woman feels absolutely NOTHING in her pelvic region when it's running. That's what's amazing about it. Very sneaky. So a man won't feel anything during intercourse either.
Also, even if you had a more powerful unit, touching anywhere on the woman's body would divert part of the current thru you -- like from her leg to yours, where it might travel upward to anywhere you're touching her. Everyone who uses a more powerful estim would love to fuck with it running, but it's very tricky to do this without screwing up the whole thing. Fucking with estim is not advised because of the fear that you will touch somewhere that let's some current pass thru the heart area. No one want to be the one-in-a-million who get a heart attack that way. But I've talked to a few people who have found ways to carefully insulate each from the other except at the genitals so they can do this.
Getting back to the first point: The first woman I ever tried a Slightest Touch on was an elderly female doctor who was familiar with medical TENS units. She thought the entire experiment was a total failure and waste of 40-50 minutes. Then I touched her clit, and she had an orgasm. When I touched it again, she had another. After about 8-10 of those, I stroked my finger across her G-spot, and she almost fainted from the intensity of the orgasm. I continued, and somewhere during the next 20 G-spot orgasms she fainted repeatedly during whole body orgasms.
That's what it's like when it works as it is supposed to.
Even more amazing: the vast majority of women don't even want to try it, although they're always complaining about poor or no orgasms.