I'm not sure that analogy holds; the Internet is just such a different thing from cinemas. Still, I'm sure no-one actually has a problem with the concept of pre

I'm not sure that analogy holds; the Internet is just such a different thing from cinemas. Still, I'm sure no-one actually has a problem with the concept of preventing under-18s from watching porn online, it's the implementation that's the tricky bit. For example, no-one has a problem with cinema restrictions, but they might do if you had to hand over credit card details to watch a film, and if it were still trivially easy for under-18s to sneak into the cinema.