Are those crickets I hear?
Legalization of porn - which happened by the threesome of the ACLU, leftist activist judges, and the porn industry, NOT by our elected representatives (keep this in mind) mandates that the various states, counties, cities and so on have no right to limit or restrict porn. They have a few little rights like porn shops can't be located within a certain number of feet from schools, or underage kids can't go buy it in "adult" shops.
But with porn all over the internet, it is inevitable that kids are exposed to it. And a certain number of adults who indulge are then more likely to seek out children or adolescents as sex partners.
Another point is that by legalizing porn, the sexual content of all media including advertising is "dumbed down". We see yearly that explicit sexual content is more and more pervasive. The amorality crowd think this is fine, but it is not.
They (you?) say that if someone does't want porn in their life, they don't have to access it. That's the same arugment abortion proponents say - if you don't like abortion, don't have one.
When we turn our culture into a garbage dump, the stench, flies and rats are everywhere, they can't be avoided.