A Billion Wicked Thoughts is one of my favorite books about sexuality. The authors used an innovative, totally bottom-up method to develop the insights they report in it. They analyzed the content of thousands and thousands of internet searches to find out what people (mostly men) are looking for when they look for sexual content online. The authors have come up with some new interpretations of their data since the book was published, and now they're creating a series of videos to delve further into these ideas.
Here's one of their new videos, a fascinating look at men's erotic interest in women of various ages.