There are some people who believe that access to certain services should be age-gated. Thus follows that a web page offering the service should handle this age gating, in the same way that alcohol sellers are responsible for checking that their customers are of drinking age.
In the Real World(TM) this is a fairly uncontroversial idea. The Internet is very wild west on these things and that has lead to interesting outcomes... but really age gating porn is in line with many things in the world.
In the Real World(TM) this is a fairly uncontroversial idea. The Internet is very wild west on these things and that has lead to interesting outcomes... but really age gating porn is in line with many things in the world.