So how exactly would this be enforced? Would every website need to have you click a box that says "Are you over 18? Click [Yes] or [No]" and then if you click

So how exactly would this be enforced? Would every website need to have you click a box that says "Are you over 18? Click [Yes] or [No]" and then if you click "[No]" it takes you about:blank or something? That might work for babies, but wouldn't most people over the age of, say, 7 simply lie and click "[Yes]"?