I found another one, in Amsterdam, on the Oudezijds Voorburgwal, next to the Oude Kerk (old church).
In the heart of the red light district.
I am told everyone calls them "de krul" (the curl), quite obvious that name.
Funny: there are two small statues on each side of the entrance, depicting a man doing what he has to do.
It was freezing when I drew this; I painted it in a nice warm café a few minutes later.