After they had sex with one another.

Thankfully, the Utah Supreme Court threw the case out.

The Utah Supreme Court on Tuesday threw out a sex-abuse finding against a then-13-year-old Ogden girl who became pregnant by her 12-year-old boyfriend, ruling unanimously that treating her as both a victim and a perpetrator for the same act had created an “absurd result.”

The girl, identified as Z.C. in court records, was found guilty of violating a state law that prohibits sex with someone under 14. She also was the victim in the case against her boyfriend, who was found guilty of the same violation by engaging in consensual sexual activity with her.

Writing for the court, Justice Jill Parrish said the Utah Legislature “clearly could have intended some degree of simultaneous culpability for both Z.C. and the 12-year-old boy under the fornication statute in order to discourage their admittedly reckless and age-inappropriate behavior.”

However, she added, legislators could not have meant to punish both adolescents for child sex abuse. “The primary fail-safe against the absurd application of criminal law is the wise employment of prosecutorial discretion, a quality that is starkly absent in this case,” Parrish wrote in a footnote.

If twelve and thirteen year old kids aren’t old enough to choose to have sex, how can they be old enough to perpetrate a sex crime?  Why do we think that prosecuting kids for acting inappropriately like this is going to change their behavior?

I say to hell with treating the kids as criminals.  Prosecute the parents who let this kind of thing happen.