《老友记》里瑞秋说过这样一句话，"Once a cheater,always a cheater."最新研究表明，这种说法有科学依据。当一个人屡次欺骗伴侣时，大脑会逐渐适应并且压根不再对撒谎感到愧疚。

Admitting you were unfaithful in past relationships is a gamble. "Once a cheater, always a cheater" is a phrase that can damage your reputation for a long time, if you're unlucky.

承认你在之前的情侣关系中不忠是一次赌博。如果你不走运的话，“一日出轨，终身出轨” 这句短语则会长期损害你的声誉。

According to some scientific research, there could actually be some fact behind the idiom.

据一些科学研究，这个习语背后可能真的暗藏着某些事实。

A new study, published in the journal Archives of Sexual Behaviour, followed 484 participants in mixed gender romantic relationships. The researchers asked the participants to report their own "extra-dyadic sexual involvement" — having sexual relations with someone other than their partner — and also whether they had suspected their partners of infidelity in each romantic relationship they had been in.

近期，一项发表在《性行为档案》期刊的研究跟踪调查了484名参与者在男女婚恋关系中的情况。研究人员要求参与者上报他们的“劈腿”关系——与伴侣以外的人发生性关系——以及他们是否怀疑自己的伴侣在婚恋关系中不忠。

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