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The head/heart duality is a well-known cultural phenomenon. In everyday speech we use "heart" as a shorthand to refer to our emotional state or our faith and "head" to refer to cognition or reason. Should I follow my head or my heart? Both "head" and "heart," while they are literally the names of body parts, are commonly used to stand for nonbodily phenonmena, for mental processes. But what body part do we use when we want to refer explicitly to our coporeal self? Whe, the humble "ass," of course! Consider the seminal gangsta rappers Niggaz with Attitude, who in thier classic track "Straight Outta Compton" rhyme: "Niggaz start to mumble / They wanna rumble / Mix 'em and cook 'em in a pot like gumbo / Goin' off on a motherfucker like that / With a gat that's pointed at yo ass." Do the guys in NWA mean to say that a gun is literally pointed downward, at your tuchas? Of course not. We understand that in this context "ass" means "corporeal self.
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David J. Linden (The Compass of Pleasure: How Our Brains Make Fatty Foods, Orgasm, Exercise, Marijuana, Generosity, Vodka, Learning, and Gambling Feel So Good)