The implementing of gender ideology in the imaginary of current welfare-state societies owes much to a long process in the history of thought, which has culminated in an accommodation of post-feminist discourse. This paper sets out the epistemological principles that are present in gender ideology, as a response to both its recent and more-remote antecedents. It is furthermore framed by an urge for emancipation that began with medieval scholasticism, the latest manifestation of which lies in the post-structuralist deconstructionism that outlines the concept of queer. This concept has dissociated the categories of sex and gender to the point of making them irrelevant for the determination of sexual identity, leaving the latter susceptible to being infinitely de- and reconstructed. This article also reviews the liberal-hedonistic context of the new postmodern setting, while showing how the concepts of ″a subjective feeling of happiness″ and ″a life fulfilled″ do not express similar content. The paper goes on to challenge the theory of gender from the perspective of metaphysic realism; stressing that the human being only appears as a real person via the possibility of anticipating another's contemplation, thereby cancelling out the abstraction of pure subjectivity. It finally offers its conclusions, with certain substantive recommendations in the field of education.