The book presents in a popular form information about human sexual health, the biological, psychological and social components of sexual health and the components of sexual life, the conditions for its normal course. The formation of partner intimate relationships, the conditions for the harmonious existence of a sexual couple, possible problems and complications of such an existence (betrayal, jealousy) are described. Data is provided on the most common male and female sexual dysfunctions and their prevention. Measures to protect against sexually transmitted infections and unplanned pregnancy have been proposed. The basics of psychohygiene of joint sexual or family life at its initial stage are presented. The appendix contains a dictionary of medical terms and the text of T. Leary's questionnaire for psychodiagnostics of the personal characteristics of partners. The manual is addressed primarily to students seeking to expand their erudition and form a holistic worldview. It may be of interest to other categories of youth.