I don't see how that's relevant
It was more of an explanation as to why we don't allow children in general to give consent on anything, not just this particular situation.
Hell, there were cases of teenagers being trialed and risking being put on the sex offender registry (although I don't know whether there was ever a case that didn't end in a plea deal to avoid that) for having pictures of themselves - THEMSELVES - or their partners of the same age on their phone
Yeah, those laws are stupid, but the logic the legal system uses is that if you are a minor and send sexual pictures of yourself to someone else, then you are technically distributing child pornography.