Always thought it would be such a good job as a gamer to work on the ratings board. You basically get to play the games so much earlier than everyone else and get paid for it. They could however just send videos of the worst parts that might push the boundries. I'll just stick to my fantasy that some lucky bastard gets to play the s**t out of these games months before release.
That's usually what happens, a long video showing the "worst" parts is sent to the boards who give it a rating. If anything is left out of the video which is in actual release then they are heavily fined.