How did the heart get its shape?

United States
February 13, 2007 4:06pm CST
hearts - upside down hearts
I've always wondered how the heart got its shape? The human heart doesnt look anything like a love heart. If you turn a heart upside down, I always thought it looked like some weird shaped butt cheeks. But other then that, nothing els really resembles the heart. So how did the heart get its shape? Who came up with a shape that looks like butt cheeks as symble of love?