First, Mary Roach conquered death in Stiff: The Curious Lives of Human Cadavers and Spook: Science Tackles the Afterlife, so last year the bestselling author decided to take on sex in the book, Bonk: The Curious Coupling of Science and Sex.
If you are unfamiliar with Roach and you missed our profile of her last year, take the time to get to know her now:
http://www.hobotrashcan.com/2008/04/24/getting-to-know-mary-roach/