Paying underage children for sex is prostitution and as far as I know illegal in all 50 states. Having these same said children cross state lines is trafficking.
Why has no one at Columbia Univ. or the NIH been criminally charged?

Columbia University and the National Institutes of Health reportedly know a lot more than parents do about the sex lives of hundreds of underage children participating in a study of teen gay sex activity.
Documentation on the NIH’s website shows that researchers at Columbia University have been tracking gay sexual activity among teenagers without parental knowledge in a research project funded by the NIH, according to The Washington Free Beacon.