To put it simply, don't engage in husband and wife life when you are old, because we men engage in husband and wife life. From the perspective of Chinese medicine, there will be yang deficiency, and physical recovery will be much slower when you are old. Obviously, if an elderly person has a fracture, the recovery cycle will be much longer than that of a young person, and so will the life of husband and wife. This is the meaning of being old.
Tell us that when we are young, we should properly control the frequency of this kind of husband and wife life, because our body also needs a recovery time. We humans are an animal species that can live together all year round. This kind of activity is not out of the original demand for reproduction, because many zoologists have observed that only humans will feel very happy when they live together. Many other animals do this activity only for reproduction, so some activities of human beings are different from other animals. Since it is for happiness, it is natural to ensure long-term happiness and health, so it is very beneficial to maintain the body by properly controlling the frequency.
There are many other health-preserving ideas in Chinese medicine, such as adapting to the four seasons' sleep and chewing slowly, which are actually put in the present life. When people get old, it is good for maintaining good health. After all, the wisdom of TCM is the crystallization of working people for thousands of years.