Nintendo, Sony, and Microsoft all have a policy that they won't sell Adult Only games. There is an online petition that you can sign for them and others to change their policies and let them sell Manhunt 2, even if it has an Adult Only rating. Here is what the petition says:
This petition submitted on June 21, 2007 is hereby presented to Nintendo of America, Sony Computer Entertainment, Microsoft Corporation, Take-Two Interactive Software, Rockstar Games, future console developers, and other software developers. We hereby petition the above organizations to reevaluate the current policy towards software titles rated by the Entertainment Software Rating Board (ESRB) to be AO (Adults Only), specifically the decision in lacking endorsement to said titles in being released. The American public has the ability to decide for themselves what software they wish to buy and would like to be given the chance to do so freely in the marketplace.
Sign the Petition Here!