For this one particular medium, The Other Wiki did a lot of studies on the Bowdlerisation subject. Now that's a lengthy article. It also needs to be pointed out that many of the anime edits—at least in North America—only apply to the television broadcast version of the show. Typically, the home video version of that same episode will be unedited (exceptions include the English-only versions of Sailor Moon and Naruto, as well as the entirety of 4Kids's output).