Both Gta San Andreas and Elder Scrolls Oblivion were changed to AO ratings once hidden code in the game was discovered. Other games were rereleased with AO ratings by the publisher, like Leisure Suit Larry Magna Cum Laud, but they added that content themselves.
Wasn't Elder Scrolls Oblivion changed to an "M" rating after the content was found?
Settle down, raise a family, join the PTA
Buy some sensible shoes and a Chevrolet
And party 'till you're broke and they drag you away
It's okay, you can dare to be stupid