X pour homme, Y pour femme: you can easily replace the X and Y with countless perfume brands that explicitly state on the bottle whether you are holding a perfume for women or for men. Other brands do it more subtly and choose a neutral name, but do have a category for women and a category for men on their website. Similarly, when you walk into a classic perfumery, you usually find a women's department and a men's department. At a time when gender identity has long ceased to be reducible to this binary division, this is remarkable. So who and what exactly determines whether a perfume is suitable for women or men?