With the increasing openness of society, “old couples and young couples” or “old couples and young couples” are becoming more and more common. Although love has no age boundaries, sex can sometimes be difficult because of the age difference. Generally speaking, the age difference between the two sides is more than 15 years, there may be sexual disharmony. Therefore, the “young and old” partners in the sex life to master some knowledge and skills, so as to eliminate misunderstandings and fully enjoy the benefits of sex. Age difference couples may face two major difficulties. One is the large difference in sexual desire. The younger party generally has a stronger sex drive, demands more frequency and intensity of sex, and is more likely to get into shape early in sex. The older party may be because of the sex hormone decline, sexual needs are not as strong, can not meet each other’s needs every time, at the same time into the state is slower, the response is not as fast. The second is that during sex, the older party is prone to a rapid rise in heart rate, which leads to sympathetic excitement, making vasoconstriction and blood pressure rise, endangering health, and in extreme cases may even rupture blood vessels, leading to sudden sexual death. In response to the above problems, first of all, the age difference between the couple to strengthen foreplay time and stimulation, more caresses, more communication, which on the one hand can increase the interest between the couple, on the other hand, help to promote the older party to enter the role as soon as possible. If the male partner is older, caressing, kissing, etc. can help erection more fully, to a certain hardness. If the female partner is older, foreplay can help improve vaginal dryness and increase lubrication. Next, choose the right position. If the male partner is older, you can take the female top position, which can reduce the excessive physical exertion of the male partner. If the female partner is older, it is recommended to use the side-lying position rear entry style to increase the female partner’s pleasure level. In addition, sex should not be too partial to physical satisfaction, couples should have more sexual psychological communication, say some affectionate whispers, can be psychologically satisfied. Finally, before sex, the older party if there is a basic disease, such as hypertension, should be controlled before stalking the basic disease, and do not get too excited and fatigued during sex. It is worth reminding that although sexual activity is largely affected by age, but age is not the only condition of sexual harmony, as long as the mastery of the sexual psychological and physiological characteristics of the couple, close cooperation, even if the age gap does not necessarily appear sexual disharmony. At the same time, the sexual life is beautiful or not, with the feelings between the couple is also closely related.