ES4: Oblivion - The Breasts That Broke the Game

Slashdot's Michael Zenke is back at The Escapist with an article on Oblivion's re-rating by the ESRB back in May 2006:

Halfway through 2006, a huge story went unnoticed by game journalists. Barely a cursory glance or raised eyebrow marked its passage. Early in May the Entertainment Software Rating Board quietly changed Elder Scrolls IV: Oblivion's rating from "T" to "M," forcing a recall and re-labeling of the game, and costing Bethesda a fortune. The problem? Bethesda had nothing to do with it.

A modder unaffiliated with the game's developers, working on her own time, manipulated art assets in the game, rendering female characters topless, and distributed her work over the internet. It was an act beyond Bethesda's control but to the ESRB objectionable content is objectionable content, and it needed to be weighed, measured and rated.