Waikiki Beach in Honolulu, with Diamond Head in the background. State lawmakers are vowing to get rid of a provision in Hawaiian law that allows law enforcement officers to have sex with prostitutes if doing so is within the scope of their duties. Robyn Beck /AFP/Getty Images hide caption

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Waikiki Beach in Honolulu. Undercover police in Honolulu say they need to be exempt from laws barring sex with prostitutes because sometimes they can't reveal their identities too soon. Ronen Zilberman /AP hide caption

itoggle caption Ronen Zilberman /AP

A prostitute in Johannesburg waits for a client on a street corner. An estimated two-thirds of sex workers in South Africa are HIV positive. Yoav Lemmer/AFP/Getty Images hide caption

itoggle caption Yoav Lemmer/AFP/Getty Images