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1. Humans are naturally polygamous.Evidence: Humans are a sexually dimorphic species. Sexual dimorphism is defined as differences in size between males and females of a species. It only exists in polygamous mating systems (and there are no exceptions). If the average human male is 6'0" and 85 kgs and the average female is 5'2" and 50 kgs then dimorphism is at least 40%. Also ALL hominids (our closest relatives in an evolutionary context including chimpanzees, gorillas and orangutans) have a polygamous mating system.2. Polygamy benefits women.Evidence: A woman always gets to choose her mate and she can have ANY man she wants (sexual dimorphism results from female choice and intersexual and intrasexual competition for mates). In polygyny a female always get to mate but because the ratio of males to females must remain 1:1 this means only a few males get to mate (typically the strongest and fittest males). E.g. If a man mates with on average 10 women then only the top 10% of males get the opportunity to mate and pass on their genes. This has the effect on improving the fitness of a species.
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