Not bad ... this book uses humor to explain everday, down-to-earth medical questions, such as the title.
The humor was dead on. And the writing pretty good. But there are really three parts of the book - the questions themselves, a framing sequence of two-page chapter openers about the authors at a cocktail party explaining the questions, and transcripts of the author's IM conversations. What? Yes, they're hilarious. But if I wanted to read IM conversations, I'd have one myself. With my friends.
They should spend more time with the questions. They could have listed many more (I brainstormed several when reading), and while I realize the answers were supposed to be short and sweet, there were several loose ends with them; they could have made their answers just a tad longer. Then there'd be more substance. As it was, the filler passages seemed as useless as the titular vestigal organs.