“Isolating specific genes is more difficult because thousands of genes influence any behaviour and the effect of any individual gene is tiny. But we did find tentative evidence for a specific gene influencing infidelity in women. More research will be needed to confirm this finding.

“虽然找到特定的基因更难，因为任何行为都会受到成千上万个基因的共同影响，很难看到每个基因的单独作用，但我们初步发现了一个会影响女性出轨行为的基因。我们还需要做更多的研究来验证这一发现。”

Experts have never fully understood, in scientific terms, why men and women have affairs. For men, having a number of partners can lead to more offspring, which would traditionally have been seen as advantageous for the continuation of blood lines.

目前还没有专家能用科学方法来充分解释为何两性会出现外遇行为。传统观点认为，男性拥有一定数量的性伴侣从而生下更多后代是为了有利于延续血脉。

The University of Queensland researchers examined data on more than 7,300 twins aged 18 to 49, all of whom were in long-term relationships.

昆士兰大学的研究员对七千三百多位18岁至49岁且有稳定两性关系的双胞胎进行研究。

Some 9.8 per cent of the men and 6.4 per cent of women had had two or more sexual partners in the previous 12 months.

在过去一年里，调查对象中有大约9.8%的男性和6.4%的女性拥有两名或以上的性伴侣。

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