sex became an issue
Of course, it had long been asserted that a country had to be populated if it hoped to be rich and powerful; but this was the first time that a society had affirmed, in a constant way, that its future and its fortune were tied not only to the number and the uprightness of its citizens, to their marriage rules and family organization, but to the manner in which each individual made use of his sex. Things went from ritual lamenting over the unfruitful debauchery of the rich, bachelors, and libertines to a discourse in which the sexual conduct of the population was taken both as an object of analysis and as a target of intervention; there was a progression from the crudely populationist arguments of the mercantilist epoch to the much more subtle and calculated attempts at regulation that tended to favor or discourage—according to the objectives and exigencies of the moment—an increasing birthrate. Through the political economy of population there was formed a whole grid of observations regarding sex. There emerged the analysis of the modes of sexual conduct, their determinations and their effects, at the boundary line of the biological and the economic domains. There also appeared those systematic campaigns which, going beyond the traditional means—moral and religious exhortations, fiscal measures— tried to transform the sexual conduct of couples into a concerted economic and political behavior. In time these new measures would become anchorage points for the different varieties of racism of the nineteenth and twentieth centuries. It was essential that the state know what was happening with its citizens’ sex, and the use they made of it, but also that each individual be capable of controlling the use he made of it. Between the state and the individual, sex became an issue, and a public issue no less; a whole web of discourses, special knowledges, analyses, and injunctions settled upon it.
Foucault, Michel. The History of Sexuality: An Introduction: 1. Knopf Doubleday Publishing Group. Kindle Edition.