1
have sexual relation with
此处relation为不可数名词，表示性交行为。
He admitted to having sexual relation with the victim.
他承认与受害者发生了性关系。
具有性性质的行为
sexual relations — plural of sexual relation
先理解核心含义，再看它在真实句子里的用法。
具有性性质的行为；un. 性交
The behavior of a sexual nature between one or more individuals.
He admitted to having sexual relation with the victim.
他承认与受害者发生了性关系。
Prepare the learner guide for this word
可生成：学习解释 Learner guide。只有点击后才会开始生成。
具有性性质的行为
The behavior of a sexual nature between one or more individuals.
They had a sexual relation after dating for several months.
他们约会几个月后发生了性关系。
The law prohibits sexual relations between teachers and students.
法律禁止师生之间发生性关系。
She refused to engage in any sexual relation without protection.
她拒绝在没有保护措施的情况下发生任何性关系。
此处relation为不可数名词，表示性交行为。
He admitted to having sexual relation with the victim.
他承认与受害者发生了性关系。
强调两者之间的关系。
The law prohibits sexual relation between adults and minors.
法律禁止成人与未成年人之间的性关系。
较为正式的表达。
They were accused of engaging in sexual relation in a public place.
他们被指控在公共场所进行性交。
Not this
They had a sexual relationship.
Use this
They had sexual relations.
“sexual relationship” 通常指情感上的性关系（如恋爱关系），而表达“发生性行为”应用 “sexual relations”（复数形式）。
Not this
He wanted a sexual relation with her.
Use this
He wanted sexual relations with her.
“sexual relation” 通常为不可数名词或使用复数形式 “sexual relations” 表示性行为；加不定冠词 “a” 不符合习惯用法。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use sexual relations naturally, then get feedback on meaning, tone, grammar, and phrasing.
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通常指性行为
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.