In an interview with the BBC (on my radio), Stephen Dubner, one of the authors of SuperFreakonomics, talked about the book. I wrote down a part of his comments, starting in the middle. Here are my notes:
...we wrote about the economics of prostitution. But we wrote about some more serious topics, too...
So there ya go! Prostitution is a giggly topic, not a serious one.
For more on that particular not-serious topic, see my earlier post.