This invention from Penn Jillette, the larger and louder half of Penn & Teller, is bound to make more than half of you happy. He calls it the Jill-Jet. It was issued on July 13, 1999. Enjoy.

The abstract reads as follows;
A spa of a type including a tub for holding water and a user, in particular, a female user. The spa has a seat for supporting the female user in a seated position, a circulation pump having an inlet connected to the tub for drawing water from the tub, and an outlet connected to the tub for discharging the drawn water back to the tub. A discharge nozzle is located within the tub and connected to the outlet, mounted to the seat so that the discharged water from the circulation pump automatically aligns with and is directed to stimulation points of the female user when the female user sits in the seat.
By the way, Penn’s got one in his backyard. Tell your friends.
Google link: http://www.google.com/patents?id=B1cZAAAAEBAJ
Penn Jillette Wikipedia: http://en.wikipedia.org/wiki/Penn_Jillette
“It was worth it just to learn some sleight-of-hand.” – Modest Mouse