this is a bad thing though. you say they "work fine" and yet there's tons of kids who go on those sites with a click of a button. doesn't seem like it's keeping out anyone who shouldn't see that stuff to me.
This isn't a matter of "getting away with" either, this is both for nsfw artists protection and the minors protection.
I realize there isn't a lot that can be done to stop minors from looking at porn except for ID verification (which I don't support) but come on, there has to be a /little/ more effort.