[FullMetalX]

Correction: The ESRB is more analogous to the MPAA than it is to the Hayes Code or Comics Code. Both those codes explicitly told filmmakers and comic writers what they could or could not do in their mediums. The ESRB and MPAA, on the other hand, are voluntary systems that the industries have conformed to. The ESRB and MPAA don't go out and tell the video game and movie industry what they can and can't do. What they do instead is see which films and games are appropriate for different audiences. It's not perfect and they do have power over their respective markets, but they're a lot more lax than the Hayes Code or CCA.