This has always been the most controversial educational content. Many people think this is vulgar and embarrassing and should not be shown to children. However, some parents think that this is educational content, and children should learn and know how to protect themselves. Universal education is for the healthy growth of children. But there are always some people who think they are better than experts and researchers and understand them better, so they oppose this kind of behavior. Sex education is lagging behind because many people don't agree with sex education, especially when children are young, and the process of giving birth to children is popular. Simply drawing in picture books was resisted by some parents and even took the Education Bureau to court. They think that children are too young to learn these things, and some teachers who popularize sex education for their children will also be sued by these parents. The court held that these teachers were just rude. Parents' lack of cognition made them stop the development of sex education. I have a friend with me. Even when she was 25 years old, she didn't know these simple knowledge of sex education. I popularized her a lot. She also asked me if you were Neptune. How do you know so much? I asked her doubtfully, didn't your teacher teach you this? She said that she had never learned this knowledge, and their physiology class only talked about hygiene and some so-called self-love, that is, some theories, but she didn't understand it, and even the teacher didn't show them condoms. During the whole explanation, I also found that because she didn't understand this matter, she didn't take precautions against many things, and she didn't understand the metaphorical meaning of many boys' words. I think she is lucky not to meet those bad boys. Education in some places is not perfect.