In sex, men are willing to do “long run champion”, hard and lasting has become the key to show their charm. “I am often asked by men how long sex lasts. In fact, sex is not just a physical job.” The complete sex consists of foreplay, substantial intercourse (from the time the sexual organs start to touch) and afterplay, of which substantial intercourse is of great concern because of its “real life”. “Substantial sex is too short, such as only one or two minutes, obviously difficult to make the couple satisfied, but not the longer the better.” Substantial sex is too long, on the one hand, will make the couple physically and mentally exhausted, and need a longer recovery time after sex; on the other hand, women play a role in sex lubrication vaginal secretion fluid is limited, too much time, the vagina will become dry and easy to rub. A survey of thousands of volunteers conducted by the Pennsylvania Biland Institute found that 7-13 minutes is the “golden time” for substantial intercourse. This is also a more comprehensive and objective survey done in the field of sexology. It is important to remember that the purpose of sex is to give both partners pleasure. When couples are in a happy mood, they often feel that “the time of pleasure is always so short”, so there is no need to calculate “how long it takes”. The male deliberately delayed the time, the original intention is only hope that women can get more pleasure. Experts suggest that it is better to “explore”, understand the partner’s sexual sensitive areas, and put more effort on foreplay, to apply rich, gentle, appropriate stimulation, to fully arouse the “resonance” of women, in order to improve her chances of reaching orgasm, which is far more effective than substantive intercourse This is far more effective than the monotonous mechanical movements of actual intercourse. Women themselves should also communicate with their partners, so that each other understand that time is not the key factor in determining the quality of sex.