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 |
| 4893668 | Curtain with sucking disks A curtain with sucking disks comprising a passage through which a rubber cord is passed and which is formed only at the upper side of the curtain or at the upper and lower sides thereof or at the right and left sides as well as at the upper and lower side... | 01/16/1990 |