As the ancient saying goes, “food, color and sex”, sex is one of the basic needs of human beings, equivalent to eating and sleeping, and cannot be missed. Healthy sexual activity will improve the quality of life, taste of life, and physical and mental health. The concept of sex is very broad, not only the direct sexual activities between the two sexes, but also covers sexual psychology, sexual ethics, sexual culture, sexual customs, sexual physiology, sexual medicine and so on. Sexual psychology refers to the psychological state and mental process related to sexual characteristics, sexual desire and sexual behavior on the basis of sexual physiology, which also includes the psychological state of interaction with the opposite sex and marriage. Sexual physiology is the biological basis for psychosexual development, and any obstacle or defect in the development of sexual physiology will cause deviation in psychosexual development. The definition of psychosexual health given by the World Health Organization is: through enriching and perfecting the personality, interpersonal communication and love style, to achieve a complete and coordinated sexual behavior in physical, emotional, rational and social aspects. Psychosexual health is an important part of human health that cannot be ignored, and has been receiving more and more attention in recent years. Sexual mental health must have the following four conditions: First, the individual’s body and mind should belong to, there is a more obvious contrast. If the yin and yang are not distinguishable, it will be difficult to implement sound sexual behavior and to obtain satisfactory love. The second is that individuals have good sexual adaptation, including self-adaptation and heterosexual adaptation, that is, to their own sexual characteristics, sexual desire to be able to accept, and with the opposite sex can get along well. Thirdly, the two sexes should be treated equally and no artificial division, discrimination or prejudice should be created. We should have a clear understanding of sexual ignorance, prejudice and all kinds of fallacies that are contrary to science, which have been formed due to various historical reasons, and we should understand and pursue sexual civilization. Fourth, to be able to enjoy sexual life naturally and with high quality. Sexual mental health, as a part of physical and mental health, is closely related to human body structure, physiological function, psychological quality and social adaptation, so the factors affecting sexual mental health are also multi-faceted. First, the quality of the parents, to a large extent, genetic and embryonic development determines the physical and mental condition; second, the person, because the individual since the understanding of the individual has a certain degree of control and responsibility for their own physical and mental development; third, the family and social education. Where people live in a scientific and civilized social and family environment, often can be natural, autonomous and pleasant to face sex, sex, while in the family or social environment, people are forced to talk about sex, dirty, mysterious, dishonorable mentality, this anti-natural state of mind, and the natural needs of life contradictions and struggles, often distorting human nature. This not only leads to unhealthy sexual psychology, but also has an adverse effect on a person’s life.