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
coitus的用法和樣例：
例句
用作名詞 (n.)
The vagina receives the penis during coitus. 陰道在性交過程中容納陰莖。
Reaching orgasm long after the beginning of coitus is a common male dysfunction. 性交長久以後才達到性高潮是男性常見的性功能障礙。
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