The book "Studies in the Psychology of Sex, Volume 5: Erotic Symbolism; Mechanism of Detumescence; Mental State in Pregnancy" by Havlock Ellis is a masterpiece that explores important aspects of human sexuality. In the fifth volume of the well-known cycle, the author examines various aspects of erotic symbolism, mechanisms of detumescence, and the mental state of women during pregnancy. This book offers the reader a deep and analytical look at the psychological processes associated with a person's sexual life, revealing the complexity of its nature and relationships with the psyche. Written at a high scientific level, Havelock Ellis's book is not only a valuable source of knowledge for specialists in the field of the psychology of sex, but also an interesting source of relevant information for a wide range of readers interested in the study of human sexuality and its psychological aspects.