名词
中文翻译：性交的不忠行为
同义词：
['infidelity', 'adultery', 'unfaithfulness']
例句：
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1. The couple's infidelity has caused significant strain in their relationship.
这对夫妇的不忠行为已经对他们的关系造成了严重的压力。
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2. Adultery is a serious offense that can lead to divorce if not addressed.
通奸是一种严重的犯罪，如果不加以解决，可能会导致离婚。
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3. Unfaithfulness is often the root cause of marital problems.
不忠往往是婚姻问题的根源。