Why Aren't ALL Women lesbians

What, exactly, is the difference between men and women, besides primary and secondary sexual characteristics? That is, why is it that women are, in general, good, kind, loving, sensitive and intelligent people, able to care deeply for others and communicate their feelings, while men are obtuse, cruel, crude and unable to express their emotions, unless one chooses to define these broadly and include "horniness" as an emotion? Are these differences primarily genetic or environmental? What could be done to help cure men? Given how hopeless men are, why aren't all women lesbians?