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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...
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.