Luce Irigaray's project elaborates an original concept of sexual difference. While this concept is widely discussed in feminist philosophy, there are multiple readings of sexual difference and some of these are contradictory. This essay surveys the various readings of sexual difference in English. Foci include the debate over the status of essentialism, ontology, and the controversy over the primacy of sexual difference, including discussion of whether her oeuvre marginalizes differences of race and sexuality. I conclude by arguing that her thinking (...) of difference is open to the future and non-totalisable in principle. This means that, difference, the concept at the heart of her thinking of sexual difference, cannot be primarily oriented toward engendering sexual difference because it is necessarily open to engendering relations that cannot be predicted. (shrink)