A guy called "3dbabes" had posted all these extreme 3D artworks about the in-game characters having sex with  weird and gross (whatsoever it might be called) monsters in a thread titled with "My 3D Hentai" in the Sankaku Complex forum. Those artworks are actually pretty professionally made, I don't know if it's true that they originally come from this "3dbabes" guy or not, but we can find the source site RGBabes.com easily from the water marks.

Well,get ready to be fired if you keep viewing this post. I have to put some shrimps(not fish,we have to use something else right?) on to save you, But you may take a full view here if you're at home(your save and tiny  winy flat and drooling over the screen)

And the followings are just some descriptions about this game that you might skip - Ninja Gaiden Sigma 2:

The most intense, challenging, action-packed ninja adventure is back, exclusively on the PLAYSTATION®3 computer entertainment system! Ninja Gaiden Sigma 2 is the "ultimate" Ninja Gaiden, featuring characters from the previous installments that have defined the franchise. It radiates a striking visual appeal in high resolution display, featuring character and environmental graphics whose quality exceeds the original Ninja Gaiden Sigma. Combining both melee and long-range battles against enemies, the game requires skillful and strategic playing to successfully journey through the missions.

Story
As super ninja Ryu Hayabusa, you roam the world and hunt down the Demon Statue that was stolen by the Black Spider Ninja Clan to prevent the resurrection of the evil Archfiend. From Tokyo to New York, follow Ryu as he encounters vicious enemies and acquires an extensive assortment of ninja weaponry along the way.