Walter and Prostitutes

Walter loved to write about prostitutes. A vast proportion of The Arcades Project is Walter writing about prostitution in the arcades. In 'Picturing Proust' when trying to explain Proust's inventive and elaborate writing style and mirroring a story told by Proust about how to locate an address at night wherein Proust gives every detail but the address, Walter writes "try locating the address of a brothel in a foreign city, even if you have been given the most long winded instructions (excepting only the name of the street and the number of the house) and you will understand what is meant here." Yeah, I think we can guess how Walter spent his evenings when visiting all those foreign cities.