Often described as the world’s oldest profession, there are few jobs that evoke such controversy. Today more than 40 million people around the world have turned to prostitution to make a living and many sex workers see their trade being as legitimate as any other. But with human trafficking and child exploitation rife in the dark underbelly of the illegal sex trade, for many others, prostitution is far from a choice. Most countries have laws against prostitution, but the practice thrives because, as with any market, where there is demand for sex there will always be people willing to sell it. Is legalisation and regulation the best way to ensure this market is a safe one for its predominantly female and frequently vulnerable workers in which to operate? Or should governments do everything they can to crack down on the practice? If so, who should be criminalised: those who sell sex, those who buy it, or both?