They’re 
at the center of an increasingly heated debate these days, but when you look at the hard numbers, games carrying a ‘Mature’ rating aren’t quite as big a part of the video game industry as they seem.
The ESRB — the board that assigns ratings to games released in the U.S. and Canada — says only 9 percent of the 1,218 games released last year received an ‘M’ rating. Such games are intended for those 17 and up and “may contain intense violence, blood and gore, sexual content and/or strong language.”
Chris Morris: Journalist 