One of the mysteries of the English language finally explained.
The genitals. Now archaic.
Early 17th century; earliest use found in Philemon Holland (1552–1637), translator. From natural + the plural of part, after classical Latin nātūrālēs partēs, plural, and Middle French, French parties naturelles, plural.
natural parts/ˌnatʃ(ə)r(ə)l ˈpɑːts//ˌnatʃ(ə)rəl ˈpɑːts/
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