"The semimetaphysical problems of the individual and society, of egoism and altruism, of freedom and determinism, either disappear or remain in the form of different phases in the organization of a consciousness that is fundamentally social."

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Most people understand that sexual lust has to do with propagating genes. Copulation in nature tends to lead to reproduction and so to more genetic copies. But in modern society, most copulations involve contraception, designed precisely to avoid reproduction. Altruism probably has origins like those of lust.

— Richard Dawkins