“But whatever its origins, when we look hard and clearly at the extent and elaboration of measures designed to keep women within a male sexual purlieu, it becomes an inescapable question whether the issue we have to address as feminists is not simple "gender inequality," nor the domination of culture by males, nor mere "taboos against homosexuality," but the enforcement of heterosexuality for women as a means of assuring male right of physical, economical, and emotional access.”