You see no negative effects because your brain grew up on porn just like everyone else you interact with. If everyone is sick then it's going to look normal. To really see the effects of porn you need to ask what could porn affect? Possibly someone's understanding of sexual ethics? Could it push their sexual interests into more and more extreme positions? The generation before has better mental health, less divorce, higher birthrates, etc. Now virtually everything is seen through a sexual lens.
There's a growing problem of women damaging their anuses
You're making a lot of claims there without proving causes and ignoring a whole swath of socioeconomic factors in favour of your bugbear, but just to disprove one, divorce rates have been on a downward trend since online pornography became really ubiquitous. So it turns out porn saves marriages!
Both of those issues sound less like problems with the porn itself but there being so much stigma around it that we can't openly talk about what is real and what isn't. (Or "Normal", for lack of a better term here. Basically what doesn't require training to do)
We have these discussions around R rated movies, Violent Video Games, and many other things. But if we could actually discuss porn and sex as naturally as we talk about these other things than people would actually properly understand what they are seeing.
There's a growing problem of women damaging their anuses
https://www.theguardian.com/society/2022/aug/11/rise-in-popu...
Here's an article talking about a teen girl's attempt to imitate porn:
>A 16-year-old girl’s bowel was so badly injured during group anal sex that she needs to use a colostomy bag for the rest of her life.
https://nypost.com/2019/01/16/teen-suffers-life-changing-inj...