The World Health Organization (WHO), the United Nations Population Fund (UNFPA), UNAIDS, and the Global Network of Sex Work Projects have developed a set of technical recommendations for effective programs to prevent and treat HIV/AIDS and other STDs among sex workers. The complete report, "Prevention and Treatment of HIV and Other Sexually Transmitted Infections for Sex Workers in Low- and Middle-income Countries," was published by the WHO Department of HIV/AIDS in December 2012. The guidelines advise that nations should decriminalize sex work and increase the access of sex workers to health services. Regular, voluntary screening and treatment for sex workers and empowerment regarding condom negotiation were other key elements of the guidelines. [The Body]
I seriously cannot think of an argument against legalizing sex work: it is safer on every level for both the buyer and seller of sex. C'mon, puritans, get it together.