提示：在最大化后代数量的目标下，考虑母亲选择生一个儿子或女儿，她更愿意做哪种选择。考虑孙子。
Hint: Think about a choice of the mother to have a son or a daughter. Which one she would prefer having in mind the objective above. Think about grandchildren.
而男性，相比较而言，外表吸引力的贡献好像并不明显。相貌英俊的男子并不比其他男性在后代数量上有任何优势。
In men, by contrast, good looks appear to count for little, with handsome men being no more successful than others in terms of Numbers of children.
而男性，相比较而言，外表吸引力的贡献好像并不明显。相貌英俊的男子并不比其他男性在后代数量上有任何优势。
In men, by contrast, good looks appear to count for little, with handsome men being no more successful than others in terms of Numbers of children.
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