The ancient Chinese Fang Zhongshu has always had the idea of ​​health preservation, and pays attention to the right time, place and people. This is the highest state of ancient sexual health preservation.

As early as the silk book "Health Prescriptions" unearthed from the Mawangdui Han Tomb, it was clearly stated that "sages must have rules for the union of men and women", that is, sexual intercourse must also abide by some basic rules. The "Yi Xin Fang Zhi Li Pian" written before the Song Dynasty quoted the "Su Nv Jing" as saying: "Neither cold nor hot, neither hungry nor full, and the body is three-dimensional, the sex will be relaxed and late." This is an article about the surrounding environment during sex. and basic physical conditions. This means that during sex, the climate should not be too cold or too hot; the food should not be too full or too hungry; the body should be stable and the mood should be relaxed.

From the perspective of modern medicine, an overheated environment can cause physical discomfort and profuse sweating, thus affecting the quality of sexual life. If the environment is too cold, the skin will open up during sex, and cold evil can easily invade and cause colds and other diseases. In addition, sex is a moderate exercise. If you do it when you are hungry, your body will be tired and weak, making it difficult to obtain pleasure. It is also harmful to the body. After sex, dizziness, cold sweats, pale complexion, and even collapse are common. If you eat too much and have a full stomach, it is not advisable to have sex immediately, otherwise it will easily lead to stomach discomfort.

Sex should be carried out at a suitable temperature for the human body, generally 21-26 degrees Celsius. The degree of heat is measured by the person sitting quietly without feeling sweating, and the degree of cold is measured by the person wearing a single shirt without feeling cold. It is best to have sex 1 to 2 hours after a meal, when you are neither hungry nor full, which is the right time.

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