&gt;  An &quot;are you 18?&quot; page isn&#x27;t going to stop anyone, but it shifts the blame from the publisher to the consumer.<p>That makes no sense, considering that someone under 18 is not able to enter into any contract (with the publisher) in most jurisdictions.  compare: It would not be enough to ask &quot;are you of legal age?&quot; before serving alcohol to someone. Proof is required.