Why can't we share a room on the winter solstice?

The ancients paid attention to sexual intercourse. On the solstice of winter, people think that yin flourishes and yang declines, and yin generates yang and yang sends out, so it is impossible to sleep together. In ancient times, people thought that the solstice in winter was the time when Yin and Yang alternated, Yin Qi flourished and declined, and Yang Qi sprouted from then on. You need to cooperate with the solar terms to drain the blood. At this time, yin and yang can not be reconciled, which easily leads to fatigue and disease. At this time, the risk of respiratory and urinary diseases is 30% higher than usual. From the perspective of traditional Chinese medicine, the winter solstice makes the yang sprout and reduces human consumption, which is the best opportunity to replenish the body in winter, and the drug effect can be preserved to the greatest extent.