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Actually it's probably more to do the memetic social stigmata from tribal times when it was far more lucid and profitable for your tribe to marry your children off to other tribes so they pay your tribe dowries. This explains why female monkeys teach their children sex as a form of social interaction but female humans do not.
One of Freud's more accessible theories.
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Aye, very good point. We do seem to get the bulk of our psychological responses via social conditioning over biological conditioning. But it could be a blend. I know animals like hyenas drive the related males out of the pack when they come of a certain age to prevent any inbreeding. Which seems to suggest there's biological 'thought' behind it that humans may also carry.
But, then, we're much more psychological in our behaviours than other animals.