Ruler Duvet Cover

These funny bed covers were made for couples to either play, or monitor themselves while in bed. The ruler that you see printed on the sheet is readable from the inside of the bed, and the numbering rises outwards from warm to cold colors. So… the game -or monitoring system- consists in finding out how much your couple can pull your sheet from you, and see how far apart your partner rests. Pretty cool, isn’t it? Source