在各种灵长类和非灵长类的生物中，某个物种一夫多妻的程度跟它们雄性的体格比雌性大的程度密切相关。
Among primate and nonprimate species, the degree of polygyny highly correlates with the degree to which males of a species are larger than females.
例如，美国海军最近为一大批航空母舰上的工作人员作了体格检查，这个检查称作安乃欣研究项目。
The United States Navy, for instance, recently examined a very large number of men working on aircraft carriers: the study was known as Project Anehin.
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