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coitus noun

  /ˈkoʊ.ɪ.təs/ , /ˈkɔɪ.təs/ , /ˈkəʊ.ɪ.təs/
  • (formal, or, humorous) Sexual intercourse, especially involving penile-vaginal penetration.
 性交
coitus interruptus
膣外射精
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