So what if we're not (biologically) equal?

“There is, in fact, no incompatibility between the principles of feminism and the possibility that men and women are not psychologically identical. To repeat: equality is not the empirical claim that all groups of humans are interchangeable; it is the moral principle that individuals should not be judged or constrained by the average properties of their group.”

Steven Pinker in The Blank Slate - The Modern Denial of Human Nature