Sex seems to be a kind of reward for the sorrowful life from God, and the reproduction of the race is just its by-product. From the perspective of sex physiology, sex is nothing more than a series of muscle movements and endocrine processes, which are almost the same for all human beings. From the perspective of sex psychology, there are huge differences among people from different countries, ethnic groups, and identities. Feminists believe that we are in a political reality of a patriarchal society dominated by men..