Whatever your opinion about what little girls and boys are made of, this is proof positive that many of our small people once armed with the proper (or improper) names for their boy or girl equipment, loooove to yell them out (especially if Grandma or a new friend is sitting nearby). It's interesting to consider the variants on good parenting.
One good parent's bottle is another good parent's breast... one's homeschool is another person's private school. But here's a funny thing: How do you know what age to tell your kids the proper names for their private parts? Or is it better to leave off all the science and just surrender to gentle and more socially acceptable approximations?
Even if you use cute-isms like "down there" or "flower," kids of a certain age will always manage to infuse the word with enough giggling meaning that most people will ascertain what exactly is being discussed. In general, I'm a believer in supplying children with the right tools for understanding themselves and this includes the correct words for their private parts.
But sometimes I regret this, when the evening's giggle-athon begins around dinner time and they laughingly announce loudly that their sibling is a "vagina-head."