Pillow partition
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A [pillow partition] is a section of pillows placed between two bedmates, who are not lovers, to avoid any accidental touching while asleep. The bedmates using a pillow partition are typically heterosexual males, who are forced to sleep in the same bed on a trip for [logistical] reasons. If one male is straight, and the others sexuality can be considered a bit ambiguous, the pillow partition is a necessity. It can also be used to save face to any other males on the trip who might joke about the two bedmates [sleeping together].
Pillow partition meaning & definition 1 of Pillow partition.