There are 27 Million modern day slaves. That's more people in slavery RIGHT NOW than during the entire course of the transatlantic slave trade. 40-50% of them are under the age of 18.
2 million of these are children sold explicitly for sex.
Buying and selling human beings is a minimum 32 BILLION dollar a year industry. It is the second largest criminal enterprise in the world, behind the drug trade. Though the drug trade and the slave trade are almost inextricably entertwined.
30% of the trafficking cases the US State Department deals with are American children sold for sex. Americans are big participators in the sex-slavery market. We sell children, we buy children, and we travel to have sex with children. In fact, the Justice Department notes that "Sex Tourists" are usually men from the US and Western Europe.