Re: Electrical stimulation?
It sounds like some form of microcurrent nerve stimulation (like TENS/MENS). It has some similarities with acupuncture/acupressure. (You might think of it as battery powered acupuncture.)
I don't know about any effectiveness for sexual disorder, though I have seen people say it helps with various other peripheral nerve problems. One very interesting and significant ancillary benefit of microcurrent therapy is that it tends to zap pathogens that get tickled by the microcurrent (like unnoticed mild fungal or bacterial infections). And side effects seem to be quite rare, so I would be inclined to try it myself.
You also might give Kegel exercises a try to improve genital nerve function. Regularly stretching the muscles of the lower half of your body might help too (like yoga or something).