Evolution the theory of how species developed. Darwin some expressions can hardly be understood, except under the belief that man once existed in a lower and animal-like condition. Intersexual competition: where one sex selects specific kinds of traits in the other sex. Intrasexual competition: competition for mates within a sex who are preferred by others as sexual partners, as well as social partners. Humans are hypersocial we live in families in societies that have developed cultures. Human emotions enable us to live social lives. Antisocial motivation: hostility: to exclude, to denigrate, and sometimes destroy others in rivalries or war, associated emotions: contempt and hatred, emotional preference for us and hostility to them seems to be an inherited human universal. Environment of evolutionary adaptedness: a description of the environment to which human emotions became adapted as our species evolved during the six million years since the human line branched off.