When I first starting taking this idea seriously, there wasn't much to go with. At the time, brain machines were all the rage. Interestingly not much came of those, and I'm not sure why. In doing my original research there was an unconfirmed rumor, that sometime in the early 1960's, General Electric designed and built a sonic shower. As part of a product test run they installed about a hundred of theses in a suburban Chicago neighborhood. They were allegedly pulled from the market less than 6 months later, because apparently many of the adult women using it were having spontaneous orgasms. I suppose back then the mere idea of such a possibility was so outrageous, that GE quickly and quietly buried the technology for fear of scandal. I've tried googling this rumor to see if someone has finally spilled the beans on it. No luck so far.

via