I think it basically doesn't happen but people like the idea so much because it's so tititilating.
Sec. Rice apparently disagrees with you
http://usinfo.state.gov/gi/global_issues/human_trafficking.html
She says 800,000 people a year.
I can further assure you that my father doesn't find anything "tititilating."
I hope it doesn't happen. I personally find the thought horrific, not titillating.
Sounds like a fate worse than death . . .