"Think of the children" is a valid argument. I don't know if there are more in-depth studies, but this study hints that the average age of first exposure to porn is at around 13 years old and the youngest being 5:
We've taught children myths, legends and now cartoons and comic book heroes for centuries, that is fine. What isn't fine is exposing them to pornography at such young age. When you're addicted to pornography you progressively seek more and more hardcore stuff, as anything milder doesn't do the trick anymore. If you want a population full of sex offenders, then go ahead.
In the US, the rates of sexual violence and violence in general has been decreasing year over year despite the estimated reporting percentage of rape increasing.
If anything, the accessibility of pornography is reducing violence.
https://archive.is/PfJd9#selection-429.17-429.66
We've taught children myths, legends and now cartoons and comic book heroes for centuries, that is fine. What isn't fine is exposing them to pornography at such young age. When you're addicted to pornography you progressively seek more and more hardcore stuff, as anything milder doesn't do the trick anymore. If you want a population full of sex offenders, then go ahead.