Plural form of coitus; multiple instances or expressions of sexual intercourse.
Direct plural of 'coitus,' from Latin 'coitus' (past participle of 'coire,' meaning to come together or unite). Medical and formal English uses this Latin plural form.
Even in formal medical writing, we kept the Latin plural rather than just adding 's'—like 'octopuses' vs. 'octopi.' It's a linguistic fossil showing how medicine and law preserve Latin grammar rules from centuries ago.
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