This is about human trafficking in general rather than just sexual exploitation but Noy does raise some interesting points. Overall the tone is that exploitation is a social problem rather than a criminal justice one. If you can't spare 19 minutes the reference to sex workers comes about half way through. (8.30). It should also be noted that this is referring to the US.
https://www.youtube.com/watch?v=oIGBBPspTKM