Shawn: I supposed Peterson was against it, yes?
Everything that is true about 20th/21st century culture, media, entertainment, advertising, business, regulation, religion, social and private behavior, and more is also true about pornography. Pornography doesn't exist on a separate dimension from the rest of society. It's a piece of the whole. It's been a piece of the whole since before photography, when pornographic scenes were drawn and painted for an elite audience who could afford such erotic luxury.
Art, music, drama, film, etc. have been democratized; it's accessible to anyone with the minimum cost of a ticket or access to streaming services. Porn has also been democratized and production is by the latest technology and distribution systems. Children routinely access sophisticated information sources I would not have thought to access at their age, sources far beyond the local public library's print collection.
Naturally -- and it is natural -- they also access sexual material. What is more alarming than 12 year olds looking at pornography, is 12 year olds looking at pornography without having had any education in sexuality--personal sexuality, and interpersonal sexuality.
Should they have such instruction? Of course they should. Before they reach 12, curious children are investigating sex with their peers. Peer-led sex instruction, though normal, is likely to be somewhat less than ideal.
People get hooked on phonics--a desirable addiction. They also get hooked on Crispy Creme donuts, Coca Cola, coffee, Diet Pepsi, work, McDonalds, the New York Times, shopping at Neiman Marcus, fishing, working out at the gym, watching soap operas, and so on. We will, in due course, become hooked on porn too -- if we happen to like it. Will spending too much time at work negatively affect your relationship? Yes, it will. Can Crispy Creme donuts ruin your life? Yes, if you eat enough of them. How watching football all the time? Heard of 'football widows'?
Investing too much of one's extra time and energy in watching porn will probably affect your relationship, along with all the other things that one can do too much of (work, watching football, becoming obese from eating too many donuts, becoming narrow minded by reading the New York Times exclusively, etc.