"The goals of the Dutch law are based on a twofold understanding. First, there was the assumption that one could separate voluntary prostitution from forced prostitution by imposing a system of regulations and create State control on prostitution. ‘Disentanglement’ of these two types of prostitution, however, is impossible for violence is an integrate part of prostitution; prostitution is hardly a positive choice.

Prostitution and violence, prostitution and exploitation, prostitution and trafficking cannot be ‘disentangled’. If there is one outcome that is common to all research in The Netherlands in the past fourteen years, then it is this. One cannot create a ‘clean’ sector: prostitution is not clean". 

Source: https://feminismandhumanrights.files.wordpress.com/2014/06/karin-werkman-2016-briefing-on-legal-prostitution-in-the-netherlands.pdf