Yes, prostitution is the "world's oldest profession."
Between 40 and 42 million people around the world are prostitutes, with 80 percent of them female and about 75 percent of them between the ages of 13 and 25.
Here's a map of where they live, which Fondation Scelles reportedly produced in 2010.
It shows national concentration by number of prostitutes per 1,000 people.
Fondation Scelle had no data for the countries labeled green:
GlobalPost hasn't been shy about covering the global prostitution industry, of course.
And here's Ioan Grillo and John Dickie's compelling video on how Mexico City is trying to regulate its booming prostitution trade:
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