We know that humans have larger brains and, within the brain, a larger angular gyrus, a region associated with abstract concepts. Also, male chimpanzees have smaller penises than humans, and their penises have spines. Not like porcupine needles or anything, but small pointy projections on the surface that basically make the organ bumpy.
http://www.cnn.com/2011/HEALTH/03/09/penis.spines.genes/index.html?eref=rss_topstories&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+rss/cnn_topstories+(RSS:+Top+Stories)
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