Robertson said sperm was more likely to fail if the woman had not previously been exposed to that man's semen for at least three months.

　　罗伯逊说，如果女方事先接触男方精液的时间达不到至少三个月，那么男方精子不能致孕的可能性更大。

　　"We used to think that if a couple couldn't get pregnant, and the man's semen test was normal, the problem lay with the woman. But it appears this is not always the case," Robertson said.　　

　　罗伯逊说：“我们过去认为如果一对夫妇不能怀孕，而丈夫的精夜化验结果又是正常的，那么问题就出在妻子身上。但看上去事实并非总是这样。”

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