I was looking for news of the bed of hot coal walkers we had fun with and how they might be "getting over it"... when Google gave me this..
Bed warmer... The term is also commonly used in the United Kingdom and Australia for a temporary sexual partner, or a relationship of necessity.
This is not to be confused with Shunamitism, the practice of sharing a bed, but not necessarily engaging in sexual relations, with a young maiden, in hope that the shared warmth and moisture would delay aging.Clicking through on Shunamitism, I see that the idea was that "the heat and moisture of the young woman would transfer to the old man and revitalize him." The term, Shunamitism, goes back to King David, who had a young woman from Shunem (named Abishag) brought to his bed to keep him warm. 1Kings 1,1. And: "Among scientific physicians, both Thomas Sydenham (17th century) and Herman Boerhaave (18th century) prescribed shunamitism for their patients." That's quite a prescription, if you can get it.
ADDED: I'm imagining Shunamitism as a New Age front for a prostitution business.