extramarital sexual relation

• 婚外性行为

extramarital sexual relation的用法和样例：

例句

1. Do you think sexual act outside marriage is wrong?
   你认为婚外性行为是不对的吗？
2. An action for alienation of affection does not require proof of extramarital sex.
   第三者插足构成侵权行为并不以婚外性行为为必要条件。