☆.A.
Haha--doesn't matter in the end.
I've taught my son anatomically correct terms ever since he was learning his body parts. It didn't stop the "ball sack" remarks, nor the "titty" commentaries! Once they're OUT of the house & in school--it doesn't matter--they're going to hear it ALL--good and bad!
On a similar note--knowing the actual manes/terms made "the talk" a LOT smoother!