An anonymous mother wrote a piece for Today titled “How to Imagine the Unimaginable.” It’s the type of story that as a parent, you can’t bear to read, which means that you must (though do be warned that it deals with sexual abuse). She details how she discovered that a babysitter had played a game called “privates”…
Source: LifeHacker – Teach Your Kids the Anatomically Correct Names of Their Body Parts