I would argue that this is a bias introduced by the legal and societal regime surround child pornography. We only have statistics for those that have been caug

I would argue that this is a bias introduced by the legal and societal regime surround child pornography. We only have statistics for those that have been caught and the prosecution also has an incentive to make the charges as extreme as possible. Also, hopefully, the police are going heavily after producers and achieving high conviction rates which would give that statistical trend.