It's just a body positioning thing. If anyone with a half-decent body bends a certain way, their ribs will be visible.
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Interesting indeed, I myself - who is a big fan of the Xbox 360 - will be getting the PlayStation 3 version, as I've read and heard personally from people who have played the game already that this version is undoubtedly superior to the Xbox 360. Granted, not as much that I would recommend going out to buy a PS3 console if you have a 360 already. Too bad that episodic content is Xbox exclusive, is Take-Two/Rockstar regretting that decision now?