This work argues from a social-theoretical perspective for the view that every concept of 'gender' remains bound to reproduction. As every culture is interested in its continuity, it distinguishes individuals according to their assumed possible contribution to reproduction and so develops a fundamental dual classification. Subsequent gender categories are necessarily derived from this one. The conceptual and empirical arguments for this thesis are illustrated through an imagined dystopia. There I envision under what conditions a complete dissociation of the concepts 'sex' and 'gender' from the old dual distinction would be possible and in what way a multiplicity of genders would be accomplished.