This introductory chapter provides an overview of the regulation of intimate interactions between the German army —as well as the police and the SS — and the local residents in Polish territory, following the invasion of Poland in September of 1939. The ban on the contact with Poles was based on their lower status in the Nazi racial hierarchy. During the “Third Reich”, the German nation was generally thought of as a biological-racial unit — a racial or ethnic body that has to be kept free of foreign and “inferior” racial influences. This book determines the meaning of this hierarchy for sexual encounters between German occupiers and Polish women, Jewish and Non-Jewish. There was a broad spectrum of sexual contact between German men and local women in the Polish territories: firstly, commercial contacts, i.e. both the occupier-controlled prostitution system and clandestine sex work; secondly, consensual contact, that is the (strictly-speaking banned) German–Polish wartime relationships, entered into varyingly voluntarily; and thirdly, forced contacts and sexual violence, such as rapes and assaults committed by German occupiers. By analyzing these sexual contacts, the book contributes to several fields of research, including the histories of everyday life and of violence during the German occupation, and expands knowledge of racial and ethnic policies.