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https://www.woodhullfoundation.org/porn-does-not-incite-violence/ Interesting article with the Woodhull Freedom Foundation.
As a nit though, I have to point out, that if something involves a "taboo", then there's a good chance that that also got coded as "violence" by this methodology (even though that is not typically what comes to mind when someone says something is "violent"). That is what critics often point out. This is mainly for #3.
While they correctly note that correlation does not imply causation (for instance, it is likely there is a third factor at play, perhaps a psychological one), there actually is a study which contradicts "criminals using more porn": https://link.springer.com/article/10.1007/BF01540933