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 |
| 5573243 | Water driven rotating figurine amusement games A water activated rotatable column game system for fun and amusement and prizes is disclosed. The system comprises a game housing having an open rear face and open side faces and an enclosed top roof and an enclosed bottom floor and an open front face for... | 11/12/1996 |