Yeah there is substantial evidence that pornography does infact promote real life sexual activities. For instance , anal porn was very popular in the 2000s-2010s.

Many women reported being pressured and coerced into engaging in painful anal sex by partners who saw it in porn and wanted to do it, regardless of the negative effects on their partner.

http://metro.co.uk/2017/07/18/teenage-girls-pressured-into-painful-and-coercive-anal-sex-because-of-porn-6788524/amp/

"Why Women Engage in Anal Intercourse: Results from a Qualitative Study" https://pmc.ncbi.nlm.nih.gov/articles/PMC4379393/ Actual research article. Peer reviewed.

And then child pornographic depictions in manga and anime absolutely fuel child abuse in real life.

Here is how sexual arousal and gratification work.

People get fixated on things that turn them on. Sometimes to the point that it's the only way they can become aroused or reach climax.

"Sexual Infantilization: The Peril in Consuming Little Girl Imagery" https://scholarworks.calstate.edu/downloads/0z709415n

When they fixate on things like incest or lollies (girls), they then seek these out in the real world.

They don't think. "Nah I'm only into incest and kids when it's fake".

Quite the opposite. They go looking for the real thing.

I'm not against porn. But I am against porn that normalizes abuse. Incest. Rape. Child sexualization.

Because it absolutely does promote these things in the real world. You can argue all you want that it doesn't but there are decades of research tracking trends that shows it does. People even often started their interest into that type of sexual area by first seeing pornography of it.

'Porn, Power, and the Brain: Pornography scripts shaping Gen Z's neurodevelopment, objectification perceptions and political beliefs" https://leadershipandsocieties.com/index.php/lds/article/view/221

There are reasons why things like smoking in movies were reduced. Because it promotes smoking while downplaying the negative effects.

Life immitates art.

So anything even vaguely resembling scientific evidence (Japan statistics) disproves it but people have opinions so let's censor it... Yeah, you are not helping your case...