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When we think of winter in Japan, we think of snow, Christmas, swimming in the cold... and the kotatsu. Its history is long, dating back to the Muromachi period when it was first constructed as a platform over a hearth with a futon hung on it. It then developed into an indispensable heating device in Japan in the winter, along with the hibachi brazier. It has played a role, so to speak, as a heater and bedding during the cold season, and it would naturally have been a common place for men and women to engage in sexual activity... [※There may be some disturbances in the video and audio]