At the risk of appearing disrespectful, let me say that the best way to understand equal opportunity is to use the public toilet. Sometimes a gross approach can best clarify a subtle issue. Through the example of how society is organized to provide men and women with the capacity to relieve themselves, we can understand what it takes, as a more general matter, to provide members of different social groups with authentic equal opportunity. In many public buildings, the amount of floor area dedicated for the men's room and the women's room is the same. The prevailing public bathroom doctrine in the U.S. is one of segregation among the genders, but with equality the guiding ideology. In some jurisdictions, this square footage equality is enshrined in law. Such an arrangement follows the dictum that equality can be achieved only by policies that are gender-blind (or color-blind or ethnic-blind) in the allocation of a public resource. To give less to women (or blacks or Hispanics) would be discrimination; to give more would be reverse discrimination.' Women and men have the same proportion of a building to use as rest rooms. Presumably this should provide members of both genders with equal opportunity for dealing with their bodily needs in a timely and convenient way. The trouble with this sort of equality is that, being blind, it fails to recognize differences between men as a group and women as a group. These differences are not amenable to easy change. Part of women's demand for bathrooms can not exist for men because only women menstruate. Women make trips to the rest room to secure hygienic and socially appropriate adaptations to this physical fact. And because men's physiology suits them for the use of urinals, a large number of men can be serviced by a relatively small physical space. Women in our society use toilets to urinate, and toilets require a larger area than urinals. By creating men's and women's rooms of the same size, society guarantees that individual women will be worse off than individual men. By dis-