I don't see the problem. All they are doing is implementing a safety measure in order to try and keep minors from accessing adult oriented material. Doesn't matter to me. In fact, I think it's a good thing and a positive thing. However, I will also say that the parents out there need to do their parental responsibilities and keep their own kids safe by monitoring their online activities, instead of relying on websites.
Oh and by the way -
The Official TrueAmateurModels.com Tumblr