The U.N. Human Rights Council published a report from the Global Alliance Against Traffic in Women which criticizes anti-trafficking measures which restrict sex workers. According to the report, “The criminalization of clients has not reduced trafficking or sex work, but has increased sex workers’ vulnerability to violence, harmed HIV responses, and infringed on sex workers’ rights.”

http://www.gaatw.org/statements/GAATWStatement_05.2013.pdf

The DailyBeast explains further "Why It's Time to Legalize Prostitution"

http://www.thedailybeast.com/articles/2014/08/15/why-it-s-time-to-legali...