New York Times columnist, Nicholas Kristof, double winner of the Pulitzer Price, had a very interesting experience with attempts of rescuing young girls from the Cambodian world of human sex trafficking. This page from the New York Times offers a few articles describing his efforts and the fate of the two girls, who were sold into prostitution, and were purchased with cash by Nicholas Kristof so that they would be freed. Worth reading. Video (a series of videos) of this and related stories from Cambodia.
Also, a video about a Pakistani woman escaping from a brothel.