ABSTRACT
Karl Marx is boldly stating that there is a universal human nature as well as one modified by a particular mode of production, and any social theory must be predicated on an understanding of that nature. All humans share a common nature by virtue of a common evolutionary history and a common genome. The human genome is the chemical archive of millions of years of evolutionary wisdom accumulated by natural selection. Evolution by natural selection is a trial-and-error process that changes a population's gene pool over time by the selective retention and elimination of genes as they become adaptive or maladaptive in their environments. Natural selection forges a sex-neutral human nature, and a second mechanism called sexual selection forges separate natures for males and females. The evolution of biparental care and monogamous mating patterns among humans put the skids to runaway sexual selection, which is why we see neither enormous size nor costly decorations in human males.
