The window ladies make more apparently than ladies working in sex clubs. Essentially the window ladies are quite mechanical in service.
I would recommend Club Asmara as a prive huis, i.e. brothel and it's easily reached by tram from the station.
There are some good live sex shows - Casa Rossa and Moulin Rouge and also some peep shows.
The sex shops, well we have sex shops here and the Internet.
The most common sight really is half drunk or sllightly stoned young English lads window shopping.
One thing though watch out for pickpockets in those narrow alleys.
For sex clubs, Germany represents better value, you quite commonly see Dutch lads in German clubs, but officially in those clubs OWO is against the law now, but it's also quite hard to get In Holland!
http://www.asmara.nl/
http://www.casarosso.nl/
http://www.moulinrougeamsterdam.nl/