"Three Essays on the Theory of Sexuality" was written by Sigmund Freud in 1905. This book reveals the nature of human sexuality. Despite the fact that Freud's theory of psychosexual development is one of the most controversial, to this day it remains one of the most influential in the world of psychology. Freud's theory of sexuality has influenced modern understanding of human sexuality and has been the subject of much debate and criticism. Psychosexual development is the main motive of Freud's entire psychoanalytic theory. This work contains three main sections - on sexual deviations, infantile sexuality and transformations of puberty. In the first part, the author examines sexual deviations in adults. In the second part, the author introduces the concept of childhood sexuality as a source of sexual deviations in adulthood. The third part of the work explores the complex path of puberty that leads to adult sexuality. In this book, Freud developed his own sexual theory. Freud's theory of sexuality is influential in psychology and beyond. This theory shaped the modern understanding of human sexuality. Freud argued that sexuality is a fundamental aspect of human psychology and that sexual development is an essential component of human development. This has become a widespread idea in the field of psychology. In addition, Freud's theory has influenced fields beyond psychology, such as literature and film. His ideas about the unconscious, repression, and sexuality have been explored and discussed in countless works of art and literature. However, some later scholars of sexuality argue that Freud's theory is too focused on sexual development and ignores other important aspects of human development. Despite this, Freud's theory of sexuality continues to influence the study of sexuality in the modern world, and it is important to continue to explore and expand our understanding of human sexuality. In the first part of his work, Freud discusses sexual deviance. To classify sexual deviations, Freud used the concept of impulse in parallel with the concept of libido. An impulse, according to the author, is a mental impulse, the beginning of which is located in certain parts of the body and which can be characterized as being aimed at a goal, for example, satisfaction, which involves specific actions and purposefulness, that is, a means of achieving satisfaction. The impulse is characterized by its multiplicity of sources, objects and goals, which led Freud to destroy the sexual instinct and its stereotypes. The description of perversions allowed Freud to show that the object of satisfaction can be replaced by another object or by the fulfillment of fetishistic conditions. In addition, satisfaction can be obtained outside of sexual intercourse (for example, exhibitionism, voyeurism, masturbation) or by focusing on parts of the body that are in principle “auxiliary”, such as the mouth. According to Freud, the explanation for sexual perversions should be sought in childhood. Because it is at this time that the idea of ​​what sexuality is begins to form in our minds. Children suffering from neuroses most often remain in a childish sexual state, and Freud wanted to trace the development of sexual desire until it manifests itself in the form of perversion, neurosis or normal sexual life. Traumatic experiences or unresolved conflicts in childhood can lead to sexual dysfunction or deviant behavior in adulthood. For example, a child who has been sexually abused may develop sexual dysfunction or engage in risky sexual behavior as an adult. The second issue that Sigmund Freud addressed in this work is childhood sexuality. Sexual attraction in children.