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The bonobos (or pygmy chimpanzee) exhibit bisexual behavior. Source: http://en.wikipedia.org/wiki/Bisexuality#Bisexuality_in_animals The bonobos have a very small DNA distance to Homo sapiens: "As their DNA is more than 98% identical to that of Homo sapiens, they are more closely related to humans than to gorillas. Another study on the similarity of critical DNA sites in human and Pan genes suggests that 99.4 percent are identical." Source: http://en.wikipedia.org/wiki/Bonobo In conclusion, it could be possible that some tendency to bisexuality were present by Homo sapiens. (Or the only difference could be the bisexuality gene... )
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