Reading though your link, something felt... Wrong ? That's not even remotely close to be a study, that's an opinion piece that threw everything at the wall, relied mostly on self-report studies, it used figures to show how sex-related things are everywhere but not to highlight their negative impact, and it seemingly also uses 40 year old data, and considering how much things have changed since then, I'm not quite sure that it is still relevant.

That's not to say I disagree with the idea that porn can have a negative effect, but using the least objective source you could have found is just...

The American College of Pediatricians are basically a fraud. It's a conservative abstinence/anti-LGTB advocacy group hoping you confuse it with the (legitimate) American Academy of Pediatrics.

A single one of the studies was from the 1980s. See the references.

But fair enough this was probably a poor source. There are dozens of papers that appear for any search on this.

Honestly, I'm surprised it's not just be intuitive. But maybe not. I've worked a lot with children in different circumstances, including in the foster system. Early sexual exposure causes issues.