Earlier quoted context omitted.
In countries where prostitution is accepted and legal, it's safer for both the sex workers and the customers, with less risk of disease and abuse. Do you know any good studies that back this up. While I certainly want to believe it and it does fit nicely with my own general political/economic narrative of the world, I've yet to find any conclusive evidence for it.
Unfortunately, it is not true. In germany prostitution was legalized a few years ago and what mostly happened was a massive increase in it. The situation of prostitutes barely improved and human trafficking went up. But you have to keep in mind that that is also the effect of only one country doing it. What would happen if the whole EU legalized prostitution is a different question.
Prostitution has been legal in Germany since before WWII. That is, neither the offering nor the use of sexual services was a crime (pimping was and still is). What changed in 2000 is merely that prostitution lost its "unconscionable" status, meaning that it can in principle be the subject of enforceable contracts.