So apparently Nintendo issued a DMCA against Tumblr to make them remove all pornographic fanart of Nintendo characters:
http://www.neogaf.com/forum/showthread.php?t=1249359
This could be pretty big, especially if they decide to do the same with other websites.
Could you imagine that? A ban on Krystal porn?! No more smut of Lucario banging Renamon?! Oh the humanity!