People think that men can not only keep fit, eliminate diseases, but also prolong life. For example, Tan Zhidao in the World, a silk book unearthed at Mawangdui, describes the health-preserving effect of men from "keeping eyes and hearing" to "being alive" through "ten movements" without venting. Therefore, it also puts forward some methods for men to control ejaculation in sexual life. This statement has certain scientific basis, but it is also quite one-sided. Xu Dachun, a famous doctor in the Qing Dynasty, had an incisive comment on this: "Therefore, the essence is the thing, and if you move, you will live, but if you don't move, you will not live. Natural immobility is beneficial, compulsion is harmful, and overuse is exhausting. Let it go, naturally there is no reluctance, and the method of preserving essence is also. "