Other Dutch cities largely have the same system as Amsterdam, though Amsterdam is by far the largest town for prostitution. I don't know what the percentages of foreign clients are, my guess is that it's pretty high in the red district but not so big outside of it. On the side of Amsterdam where I used to live (west part of the city centre) I'd say almost all the clients were Dutch (and men between 40 and 60).

I'm a bit behind the times on the issue, it seems, I found out through a google search that the city government has been getting tough on criminality in the sector, withdrawing the permits for 20% of the locations because of ties to criminality last November 30th as part of its first of three 'screenings'. This kind of shows how big the problem was.

Organised crime is probably big in every major European city. Here in Berlin there's a lot of Turkish and Russian mafia. In Amsterdam there's a big local underworld, as well as Yugoslav, Bulgarian and Israeli mafia. (This is what I get from the buzz, more or less, I have my finger on the pulse of the underworld and all that jazz, you know, by which I mean to say that I don't know).