http://rld-europa.com
Antwerpen
The general area is known as Schipperskwartier which has recently been 'developed' or 'tamed'. The area of interest still is between St-Paulusstraat and Brouwersvliet, including Verversrui, Vingerlingstraat and Schippersstraat. The Villa Tinto is a major establishment in the area - more information on this link
Brussel / Bruxelles
Rue d'Aerschot/Aarschotstraat, just behind the gare de Nord
At the southern end of the Aarschotstraat, there are also windows to be found on the rue de la prairie which is off to the left (going South) and the Plantenstraat/rue des plantes and rue Linné which are off to the left of the rue de la prairie
There have been continual attempts to ban street prostitution in the Alhambra Quarter (to the south-west of the gare du Nord. The map shows this district with the proposed new 'allowed' streets. As far as I can make out, the old area is still 'active'. A city regulation of 2016 benning the prostitutes from this area was overturned by the State Council before Christmas 2016. So at the moment, everything appear to still be unchanged
see • Hotel Studio 2000
The new 'proposed new areas' are
• boulevard d'Anvers between the rue de Laeken and the rue du Pélican
• boulevard Baudouin between the chaussée d'Anvers and the boulevard Albert II
Charleroi
The trade has recently been officially prohibited in Charleroi except for the establishments on faubourg de Bruxelles and the N5, both in Gosselie, to the north of the town
The trade formerly centered on 'Le triangle de Charleroi' bounded by the rue Moulin, rue Desandrouin and rue Fenderie, but was officially forced to move by the council to the area around the ministère des Finances: rue des Rivages, rue Monnet, la place des Tramways and the beginning of rue du Grand Central, up to the junction with the rue des Rivages. Seemingly, the trade in the Triangle kept returning and the 'new' areas were less secure. Whether the trade still exists in these areas, irrespective of the new regulations, I do not know at the moment.
Deinze
Kortrijksesteenweg (N43) on road which leads to Sint-Martens-Latem
Gent
Two streets near to each other :-
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Pieter Vanderdoncktdoorgang (300 meters north of Gent Zuid railway station (and City Shoppingcentre Gent Zuid), also referred to as glazen straatje presumably because of its arcade nature (see picture).
Belgradostraat, a hundred meters or so further North.
Liège
The situation is in a bit of flux at the moment, I believe - follow this link for further information
Oostende
Confused about the current situation - have various addresses but unsure about their current validity. Addresses include Langestraat (north of the ferry port), Hazegras (adjacent to the railway station), Fregatstraat, Vrijhavenstraat, Oesterbankstraat.
Seraing
rue Marnix
Sint-Truiden
Windows along Luikersteenweg (the N3 road between Sint-Truiden and Liège), known as "Chaussee d'Amour", colloquially, apparently).
Stories tell of traffic being regularly held up because of this 'distraction' and of a higher-than-expected accident rate along this route.