 That said, the account still faces some of the problems we see with other ability-limitation-based accounts. The non-pathologizing sense of impairment as “functional difference” may not in the end be specific enough to distinguish disability from other kinds of unjust absence of ability. Begon addresses this in the case of sex difference, arguing—in effect, with Boorse—that differences in the “reference class” or appropriate functional norms applying to males and females of the species make for differences in what counts as an impairment between males and females. So, for instance, an inability to get a good-paying job resulting from possession of the capacity to menstruate is not a disability, because that capacity is not atypical for female human beings. Such a way to address the problem may not cover all forms of oppression since much oppression seems to be evoked by differences that are functional in some sense—sexual orientation relates to the function of our dispositions to sexual attraction; absence of athletic ability (within the normal range) to the function of the musculature; even pigmentation, to the function of the epidermis in protecting the organism from the environment.