Here is an example of "pimping" a kid out for money....
http://wsbradio.com/localnews/2010/03/parents-prostitute-child-for-c.html
The couple bought a minivan from a used car dealership in Eastman, about 140 miles southeast of Atlanta, in March 2008 but has not made a single payment on it, Winborn said. They made their daughter perform sex acts on the dealership's manager in lieu of making the $281 monthly payments on their minivan, he said.
_____________________
Here is some info from an ABC story...
http://a.abcnews.com/US/Story?id=3691604&page=3
Statistics Hard to Come By
Exact numbers of actual parents prostituting their children both in the real and virtual worlds are difficult to come by, academics and law enforcement authorities told ABC NEWS.
But in the FBI's fiscal year that ended in August, the government opened a total of 2,443 new investigations into child sex crimes on the Internet and achieved 1,015 convictions. In 2006, the FBI opened a total of 2,135 new investigations and won 1,013 convictions.
The bureau said it doesn't keep statistics of how many of those cases involved parents.
Children are more likely to end up as prostitutes in the real world than the virtual world, experts said. The Department of Health and Human Services puts the number of children at risk for sexual exploitation in the United States at around 400,000.
But according to Janice Wolak, a professor at the Crimes against Children Research Center at the University of New Hampshire, it's difficult to know how accurate that number is.
"It's really hard to get a solid number. We've tried to survey national law enforcement departments, but the number of arrests doesn't reflect the real number of kids prostituting. It is an incredibly elusive population."
Wolak estimated that a small population, less than 10 percent of all children working the streets as prostitutes, were being pimped out by their parents.
"In a typical scenario, a parent is already involved in drugs or prostitution in one way or another. Parents prostitute their kids for drugs or money," she said.