On Rotterdam look for "privehuis" . These are parlours with a dozen of girl on rota.
You can turn up and be presented to any girl available. or book in advance looking at their website if certain girl float your boat.
If you want a RLD, then Den Haag is your best bet, only 15 min away by train. The street are Geleenstraat (better) and Doubletstraat (rougher)