In exploring the essay title, it would seem wise to explain the terms “Gender” and “Inequality” (Antony, 1998). Within this essay, “gender” refers to the socially defined differences between men and women. As the word suggests, “inequality” means unequal rewards/opportunities for different individuals within a group or groups within a society. Feminism is said to be the movement to end women's oppression. One possible way to understand 'woman' in this claim is to take it as a sex term: 'woman' picks out human females and being a human female depends on various biological and anatomical features (like genitalia) (Armstrong, 1989). Historically many feminists have understood 'woman' differently: not as a sex term, but as a gender term that depends on social and cultural factors (like social position). In so doing, they distinguished sex (being female or male) from gender (being a woman or a man), although most ordinary language users appear to treat the two interchangeably (Harris, 1993). More recently this distinction has come under sustained attack and many view it nowadays with (at least some) suspicion. This entry outlines and discusses distinctly feminist debates on sex and gender.
Catherine MacKinnon develops her theory of gender as a theory of sexuality. Very roughly: the social meaning of sex (gender) is created by sexual objectification of women whereby women are viewed and treated as objects for satisfying men's desires (Grosz, 1994). Masculinity is defined as sexual dominance, femininity as sexual submissiveness: genders are “created through the eroticization of dominance and submission. The man/woman difference and the dominance/submission dynamic define each other. For MacKinnon, gender is constitutively constructed: in defining genders (or masculinity and femininity) we must make reference to social factors. In particular, we must make reference to the position one occupies in the sexualised dominance/submission dynamic: men occupy the sexually dominant position, women the sexually submissive one (Armstrong, 1989). As a result, genders are by definition hierarchical and this hierarchy is fundamentally tied to sexualised power relations. The notion of 'gender equality', then, does not make sense to MacKinnon. If sexuality ceased to be a manifestation of dominance, hierarchical genders (that are defined in terms of sexuality) would cease to exist.
So, gender difference for MacKinnon is not a matter of having a particular psychological orientation or behavioural pattern; rather, it is a function of sexuality that is hierarchal in patriarchal societies (Antony, ...