What did everyone’s family call “private parts” when they were kids? Girls parts were “twinkle” and boys were “Willy” but I’ve heard some strange and wonderful names over the years.

The Oxford English Dictionary suggests that some words we think of as crude entered the English language before their polite equivalents, e.g. "cock" is circa 1335, "penis", 1578. (These are the earliest citations the dictionary has, though each word will be somewhat older). "Bollocks", according to the dictionary, was apparently the standard term for the testicles until the seventeenth century. The dictionary notes that the word "pintle" for "penis" is Old English (pre-Norman Conquest) and survives as a dialect word - they give a quotation for it as late as 1990. To answer your question, my father taught me the correct terms.