nature's duty:

C17 ^th British euphemism for sexual-intercourse . See copulation for synonyms.
See Also: abominable and detestable crime against nature, abominable crime against nature, blue joke, blueness, Captain of the Head, defecation, detestable crime against nature, dish dirt, in puris naturalibus, mother nature calls, pitch woo, state of nature, take liberties with someone, turns, the, urination, yin

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