The prostitutes can get a colour for 40 euros there.
They sit on stools outside their open doors in long, dark corridors that smell of cigarettes and air freshener.
However both men and women go through each of the four phases and their end results are the same in both sexes.
And Germany and the Netherlands have repeatedly ranked among the five worst blackspots.
Given that at least 70 per cent of trafficking in Europe is into forced prostitution, a lot of people are arguing that the best way to reduce demand for trafficking is to reduce demand for prostitution.