Work only through the Prostitution Information Services.
Their is a huge amount of rip off people and hustlers. Can't stress that enough.
Links of that sort are forbidden here in HB's so you can do a search.
Pre-Book the canal boat through a reputible service too.
Don't wing it, have it all ready up front.
They may be liberal on several things in Holland, but not on DUI boating or driving so have a clear head about that.
Arraignments can be up to a year wait.
AIDS is an issue amongst the drug and sex industry in Holland.
Eyes wide open.
Friends that go there regulary say they generally hate Americans.