If you have kids, maybe you have "the talk" all planned out. But even if you read from a script, kids have a clever way of making things awkward. After all, we really take for granted how little young kids know and understand - and how quickly they figure things out.

In this hilarious video, Julia Sweeney explains how she first described sex to her eight-year-old daughter just by following her line of questions. It leads from tadpoles to cats and dogs and, eventually, to human beings. That makes sense. We all pretty much have sex the same way. The trouble is, where do the legs go?

(If you enjoyed this short video, check out Sweeney's full-length essay on the topic here.)