A man partnered with an infertile woman is, infidelity aside, as evolutionarily irrelevant as if he were sterile himself.
在不考虑外遇的情况下，一个男性与一个不能生育的女性作伴侣，进化不谐的程度和他自己不能生育差不多。
According to one survey, one woman in eight is infertile.
根据一项调查，每8个妇女中就有1个不能生育。
For the population to stand still, each woman needs to have 2.1 children (one child per parent, plus an extra 0.1 to account for women who die young, are infertile, or otherwise do not have children).
要维持人口不变，每位育龄妇女就要抚养2.1个孩子(每位父母一方抚养的一位孩子不能生育，或者反过来说没有孩子，外加0.1个点补充年轻死亡的女性)。
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