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Message: <blockquote data-quote="newusername" data-source="post: 6202423" data-attributes="member: 562064">Humans have 23 pairs of chromosomes (46); chimpanzees have 24 pairs of chromosomes (48).  Since both human and chimpanzee genomes have been sequenced, we see that at some point there were two chromosomes (usually referred to as chimp 2A and 2B) that fused together to create human chromosome 2, which is why we now have 1 less pair.The question at hand is a tough one to assess.  From the perspective of evolutionary psychology, it could be considered as perhaps a misfiring of a module in the brain used for different purposes, and it is certainly not clear that there would be an evolutionary advantage to having *** with something that you cannot reproduce with.  Evo-psych is not a particularly concrete field, though, and these questions are still pretty up in the air.</blockquote>

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