Thanks to Barnorama for this:
The Dutch town of Utrecht is famous for two bizarre highlights: mechanical music museum and floating barges full of prostitutes.
Window prostitution occurs mainly along the Vecht to the Zandpad, also known as Red Bridge.
The window prostitutes are working in houseboats . The windows are visible from the car, the use of the car is popular among prostitution customers.
There are about 40 boats and 140 working girls.