Tocqueville, in his book “Democracy in America”, talked about the concept of sexual morality, introduced it into his newpolitical science, and reflected on the situation of social morality before and after the French Revolution with the help of hisinvestigation of American social morality. From the end of the 19th century to late 20th century, the development of sexualmorality in the US and France has undergone different changes. In France before and after the Revolution, sexual ethicsshowed a very different picture, from palace porn culture and pornography before the Revolution to revolutionary moralethics during the revolutionary period and to sexual ethics after the revolution. The US turned from the Puritans' sexualmorality in the early 18th century to the sexual liberation movement in the 19th and 20th centuries. From the historicalexperience of the US and France, we can see three basic forms of sexual morality: the state of greed, the state of politics, andthe state of holy love. The revolutions were not only initiating the construction of democracy, but also changed the definitionof its most basic figure that is the individual. This paper places sexual morality in the three dimensions of reality, politics andreligion. Taking The United States and France as examples, with the help of textual analysis and comparison, thedevelopment course, different forms and contemporary values of sexual morality will be explored.