[All-In Flynn]

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Why can't sexuality be both genetic and social (i.e. nature and nurture)?

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Well, ultimately everything is a combination of both, since a gene can generally only find successful phenotypic expression in an environment hospitable to that expression (while that environment primarily consists of other genes, 'pure' environmental factors obviously play their part). I'd say that ultimately the distinction between nature and nurture is a matter of discursive convenience.

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In other words, people are bisexual by nature favoring sexuality toward one pole or another (pun intended) and rare for someone have exactly, or near, equal preference.

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This is what seems intuitively to me to be the case. But I don't see how this could come about from an evolutionary point of view. Guess I should really Google this stuff before hectoring people about it.