One scarcely needs to add that the opposition male/ female is the best-known example of this, for in this supposed opposition the female term has often been shown to have the value only of a minor exception, one that is easily absorbed by the unmarked, male term that stands in for both. What was new or unique to bio-politics, then, was the invention of something called sex, which permitted life to be sublated by history. Prior to this, blood, consanguinity, had played a major role in the machinations of power, but with the invention of the sexual mirage hereditary allegiances and consanguine loyalties tended to be downplayed – if not completely eliminated. The species being promoted by bio-power and the globalized economy of capital came to depend on a more individualized notion of the subject, one less encumbered by the older order of hereditary allegiances. The invention of sex, Foucault is saying, aided the construction of a completely individualized notion of the subject, one which caused the realist universal – that in the subject which is more than the subject – to disappear. Or: bio-power issues in the era of the multiple rather than the divided subject.
I remember Barthes says something very similar. Showing the move from a semiotics with signs fixed to their referents. Coherency. Then to sliding signifiers. Then to money which travels down lineages. And to sex, reproduction. Something like that. I don’t remember what it was called.