I do, and because the Canadian Centre for Child Protection has an extremely good reputation in Canada, I will quote some of what they've said about the fact that all children have access to porn without any kind of research on their age.
The centre says the harms to children exposed to sexually explicit material include “difficulty forming healthy relationships”, “harmful sexual beliefs and behaviours” and “a normalization of sexual harm.” Because porn is there, it's normalized; the porn they see, which can contain violence and degrading acts, is normal for them, so obviously they're more susceptible to being harmed by a pornographer.