If you have a random app (unrelated, not a porn site) showing ads (unrelated unless a porn site) of alcohol services (not sure what that is, but .. unrelated/not porn), how does this apply?
How would you age-gate ads? Wouldn't that require a new X-KID-PRESENT: 1 http header so that each and every ad network can suppress ~questionable~ content? In fact: That's a great thought experiment: Is a site that serves ads that might contain 'adult' ads at times a porn site according to the British government and would need to verify that the visitor is of age?