German camp brothels in World War II
In World War II, Nazi Germany established brothels in the concentration camps (Lagerbordell or Freudenabteilungen, "Pleasure Departments") to increase productivity among inmates. Their use was restricted to the more privileged Aryan prisoners, primarily the kapos, or "prisoner functionaries", and the criminal element.
Source: Wikipedia — German camp brothels in World War II (CC BY-SA 4.0)