Edain: Bed-warmer is a euphemism, referring to a low-status person who has sex with a high status-person. Sometimes a chieftain or lord will offer guests the services of his bed-warmer.
Sindar: Bed-warmer describes a servant who literally warms a the bed of a high-status person by climbing between the covers beforehand, then getting out when the bed’s proper owner wishes to sleep. This is viewed as entirely non-sexual due to the culture of extreme monogamy.
Noldor: Bed-warmer refers to an intricate device invented in Valinor that is essentially an electric blanket but magic. Frequently offered to guests who are less accustomed to the severe weather of a location, especially human guests who are more fragile than elves.
Dwarves: Bed warmer refers to an item with high heat capacity that is placed in a fireplace to warm up and gradually cools down over the next several hours. The dwarven bed-warmer is the only one which poses a significant fire risk if used improperly.
