The problem with a lot of these studies is they are also done in a society that highly stigmatizes sexuality and porn.
Many of these things can also be mitigated by an ability to have open conversations about feelings about what they see. Same with playing violent video games, watching R rated movies, or whatever.
Maybe I should have added, I also hope we can rise above the level of discourse where a single though is viewed as enough to dismiss a bunch of studies.
I am not dismissing the studies, but we have to look at the studies through the society that they were done in.
To ask, is the study saying that there is an inherent problem with porn in an isolated bubble or is the problem with porn in the way our society is setup. That is a very important question and drastically changes the conversation and the action items.