Why is sex an indispensable part of human beings, but human beings think it is dirty?

+Sex is the way for human beings and animals to reproduce species, the basic condition for species to be passed down from ancient times to the present, and the process for modern people to develop sexual pleasure experience. In modern society, which can have a lot of free time, sex has also become an important life activity for people to enjoy pleasure and pursue pleasure consumption. Sex bears the important content of reproducing life and improving the quality of life.

+Sex is dirty and an ethical system based on traditional culture in the past. For two thousand years, both the East and the West have had abstinence moral norms, the West is caused by religion, and China is caused by Confucian morality. It is perfect and good to advocate that people should abstain from sex. At the beginning of the last century, the west began to reflect on the bondage of traditional morality to people, break the bondage of religion and morality to sex, and began sexual liberation activities. After the reform and opening up, influenced by western culture, China gradually accepted the concept of sexual freedom and sexual liberation, which is still continuing. As East Asian countries, Japan and South Korea have been influenced by American culture since the 1940s. Their sexual freedom and liberation were much earlier and more open than in China, and they were ahead of China.