The Full quote

In the first volume of The History of Sexuality, Foucault argues that the univocal construct of “sex” (one is one’s sex and, therefore, not the other) is (a) produced in the service of the social regulation and control of sexuality and (b) conceals and artificially unifies a variety of disparate and unrelated sexual functions and then (c) postures within discourse as a cause, an interior essence which both produces and renders intelligible all manner of sensation, pleasure, and desire as sex-specific. In other words, bodily pleasures are not merely causally reducible to this ostensibly sex-specific essence, but they become readily interpretable as manifestations or signs of this “sex”.