I am happy to fulfill the request of my employees Borelli and Starck to provide a foreword for their study "Prostitution as a Psychological Problem," as I consider this monograph an important contribution to sexual research. The issue of prostitution and the psychological characteristics of prostitutes is one of the oldest human problems and has repeatedly attracted the attention of doctors, psychologists, and sociologists. Among medical professionals, dermatologists were at the forefront: names such as Fournier, Neisser, Delbanco, V. Duhring, Ducrey, Riecke, V. Zumbusch, Jadassohn, and Gougerot must be mentioned here. Their investigations primarily focused on the treatment and prevention of sexually transmitted diseases transmitted by prostitutes, as well as the health monitoring of these women. Furthermore, it is concerned.