Sex education has a narrow and broad understanding and implementation. In a narrow sense, sex education refers to the dissemination of knowledge about sexual physiology, psychology, social and cultural connotations, and the maintenance of sexual health and disease prevention. Sex education in a broad sense also includes imparting knowledge about gender awareness, gender socialization and gender equality, as well as comprehensive and systematic life science knowledge about love, mate selection, pre-marital preparation and marriage adjustment, and family life. Sex education is a lifelong educational process. It provides people with complete information and helps them to establish correct beliefs, values, attitudes and activities in their sexual identity, sexual relations and intimate behaviors. The information of sex education includes the occurrence and development of sex, reproductive health care, sexual relations between people, sexual activities, sexual roles and so on. Any aspect and any problem will involve people's reactions in three dimensions: cognition, emotion and external behavior in four fields: biology, social culture, psychology and religious spirituality. This complexity determines that systematic sex education is irreplaceable. Sex is a science, and there are different understandings of sex science: the first is a narrow understanding that sex science is a science that studies human sexual behavior; The second is the understanding of the middle meaning, which holds that sex science includes four parts: sex physiology, sex psychology, sex ethics and sex sociology; The third is a broad understanding, that is, in addition to sexual physiology, sexual psychology, sexual ethics and sexual sociology, it also includes the study of love, marriage and family, humanities and sexual philosophy. At present, the public's understanding of sex science mostly stays in the narrow understanding stage, and it is less promoted to the middle meaning level, and the broad understanding is even rarer. Sex education, corresponding to the education of spreading sex science to the public, also has different contents and methods because of different understanding of sex science. A complete sex education system should include the following six aspects: human development: adolescence, sexual anatomy, reproduction, physical and mental health, interpersonal relationship between sexual orientation and sexual identity: friendship, love, dating, marriage, family, lifelong commitment and education of children's life skills: value discussion, communication, consultation, decision-making, thinking, self-affirmation and stress-resistant sexual behavior: masturbation, abstinence, sexual behavior sharing, and sexual behavior sharing. Sexual fantasy and sexual health: contraception, abortion, sex and eugenics, sexually transmitted diseases, AIDS and sexual abuse and society: sexual ethics, gender roles, gender equality, sex and art, sex and media, etc. Many teenagers search for "sex education films" on the Internet, and the content they want to get is mainly about sexual behavior skills or masturbation skills. Regardless of whether these films are scientific or not, it can be seen from the contents involved that teenagers' understanding of sex science is at a narrow stage. Compared with the above sex education syllabus, these so-called "sex education films" only cover sexual behavior, not complete sex education. It is precisely because of the narrow understanding of sex science and the one-sided understanding of the content of sex education that people worry that sex education will increase teenagers' sexual behavior! In the past, the physical health textbooks of middle schools included the introduction of male and female reproductive organs, adolescent health care and other health education, involving the content of sex education. However, as can be seen from the above sex education syllabus, these are not complete sex education, only including human development, accounting for only one sixth at most. A complete sex education should be personality education and life education. Some people may read the above outline and ask, how to educate children is the content of sex education? Seemingly unrelated issues are actually closely related. Think about how you became a parent. How can you be a parent if you don't participate in the "piston movement" in bed? Therefore, how to educate children is their responsibility for their sexual behavior. Future love and marriage are between men and women, and marriage education is an important part of sex education. How to be a good man or a good woman and how to achieve gender equality always runs through sex education. The focus of sex education is not sexual behavior and some basic physiological knowledge, but interpersonal relationships and personal skills. Different people have different views on how to treat unmarried cohabitation, and their own sexual concepts can be established through the discussion of values; Being rejected after confessing to the right opposite sex, how to adjust one's mentality requires creative thinking in the new era; It is a basic skill to make a reasonable decision whether to have children or have an abortion according to one's own situation. As a girl's boyfriend, I asked for sex, and I don't want to have sex now. What should I do? Communication and consultation can be solved without hurting each other. The purpose of sex education is to improve the sexual health level of the whole society, improve the quality of human life and promote social civilization.