For fun I looked at a few things after I went there last May (in case I go without the SO).
There appears to be a few agencies with international workers there, as well as some local girls. My understanding is because its Dutch and a "rich" platground that LE is not a factor as long as discretion is there.
Pricing for the agencies and locals was all over the board. I figure due to servicing both locals and service personal vs the tourists.
I don't have the links(erased them) but with a bit of google research you can find what you are looking for I'm sure.