Thanks guys for the info guys. Had a read through the hookers.nl page and it seems a bit outdated/not as frequented as this page, unfortunately. I found Kinky.nl, which seems to be very popular but no real reviews, sadly. Due to that, and the unknown, we kind of decided to go with an agency, for a sense of security (well sort of). I only found a few that are listed on kinky, and none of them actually has replied to any enquiries. Bit sad, really...