This is the knowledge mentioned in the unearthed cultural relic book "Elements of Life". In other words, the five days of the second, third, fifth, ninth and twentieth day of each month in the lunar calendar are called lunar nights. What's the use? In other words, sexual intercourse between husband and wife takes place in the middle of the night. First, it will not be harmful to health or very small. Second, once a child is pregnant, the child is born with excellent innate talent, smart and filial! Third, it is conducive to having boys. Of course, there are other factors to make good use of, which will be ideal.

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