1
have coitus
最常见的搭配，但正式程度较高。
They had coitus for the first time.
他们第一次发生了性交。
性交，交媾
先理解核心含义，再看它在真实句子里的用法。
性交，交媾
the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur
They had coitus for the first time.
他们第一次发生了性交。
正式用语
男女之间的性行为；男性的阴茎插入女性的阴道并刺激直到达到高潮和射精
the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur
In biology class, we learned about the process of coitus in mammals.
在生物课上，我们学习了哺乳动物交媾的过程。
The doctor explained that coitus can sometimes lead to pregnancy.
医生解释说，性交有时会导致怀孕。
The study examined the physiological responses during coitus.
这项研究检查了交媾过程中的生理反应。
最常见的搭配，但正式程度较高。
They had coitus for the first time.
他们第一次发生了性交。
更正式的用法，常见于医学或学术语境。
The couple engaged in coitus regularly.
这对夫妇定期进行性交。
使用介词'with'引出对象。
Coitus with a partner is a natural act.
与伴侣性交是一种自然行为。
Not this
They had a coitus last night.
Use this
They had coitus last night.
Coitus 是不可数名词，不能用不定冠词 'a'。去掉 'a' 即可。
Not this
They coitused in the bedroom.
Use this
They engaged in coitus in the bedroom.
Coitus 是名词，不是动词。应使用动词短语 'engage in coitus' 或直接说 'had coitus'。
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正式或医学术语，不可数
Dictionary facts from ECDICT, WIKTIONARY.