It is absolutely ridiculous to charge teens with child pornography for taking pictures of their own bodies and sending them to a few friends their own age. It should be up to the parents, not the state, to handle such situations.
It does a disservice to all those precious souls that have been harmed by real child predators over the years to go nuts over this. It minimizes the evil that is actual child pornography.
The judge can consider circumstance in Sentencing - period.
Your intent to create a loophole allowing the production and dissemination of child porn when produced by children - while an attractive workaround to NAMBLA and the Larry Flint crowd would have devastating consequences to millions of children who already have little chance of receiving justice through the legal system.
You have zero perception of the danger this poses in allowing a creative way for child pornographers to LEGALLY produce their sick wares.