My mom definitely checks the rating on the back of the movies. For example, a couple of weekends ago I wanted to watch a movie with my friend, and she was like, “Oh, what's it rated at?” I said, “I think it might be 14A or rated R”, and she said, “I don't want you watching that”, so I wasn't allowed to have my friend over.
On April 1st, 2008. See this statement in context.