I don't like this but don't have another solution other than the porn industry self-policing which isn't promising.
Somehow we've inappropriately shifted responsibility away from parents/guardians in some areas like internet access.
In other areas, like letting your kid go outside by themselves, we've criminalized reasonable caregiver actions.
It's a wild world.
I think the real issue is that the definition of "reasonable" is subjective and often changes with time/culture/people in charge at the moment.