Addressing sexuality as a historically unique experience requires unraveling the knowledge they refer to, diving into the systems of power that regulate their practice, and, above all, understanding the ways in which individuals are conceived and declared as subjects of that sexuality. The history of sexuality, the most ambitious project in the work of Michel Foucault -of which he only managed to publish the first three volumes-, is a dazzling and iconoclast exploration of the real games through which the human being has recognized himself as a man of desire. Its second volume, The Use of Pleasures, is devoted to the way in which sexual activity was problematized by philosophers and physicians in the classical culture of the 4th century B.C. Why are the sexual behavior, the activities and pleasures that depend on him, the object of a moral concern? In raising this question to Greek and Greco-Latin culture, it came before me that this problematization was linked to a set of practices that had considerable importance in our societies: it is what we might call “the arts of existence.” I will start from the then common notion of the use of pleasures, and I will study the way in which medical and philosophical thought formulated some issues of austerity that will become recurrent in four main axes of experience: the relationship with the body, the relationship with the wife, the relationship with young men and the relationship with the truth. Michel Foucault