You...just don't remember the number of porn actresses who started between 15-18 with fake ID's, or who were coerced into porn acting by partners or pimps, who owned up to it later with little to zero legal action being taken on anyone? Of whom Traci lords was the most famous, and one of the few for whom legal action was taken (because authorities had been tipped off after her 18th birthday), but far from the only one.
And of course, going hand in hand with thst were the days when video rentals' porn sections weren't separate from the rest of the store, and when porn mags were sold right alongside every other periodical without so much as slip covers. Hell most stores took measures against that not for minors' sake, but for grown-ass adults who didn't want to be seen buying/renting porn, or to prevent shoplifting.