Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| 7200879 | Waterfall waterjet with debris removing outlet A waterfall waterjet that can be attached to a spa, with at least one chamber, at least one primary outlet, at least one debris outlet that can be opened and closed, and a water source fluidly connected to the waterfall waterjet. ... | 04/10/2007 |