Being on the older side of gamers, I have never run into this or even given it second thought. However, Major Nelson had a
great post on his blog today regarding why those Xbox Live Members that are under 18 can't download Demos or Trailers that are rated 'M' or 'RP'. It all goes back to the ESRB guidelines, which impact not only Xbox Live, but Playstation Store and Wii Shop Channel. Interesting stuff, and something that I was unaware of.