Mary Roach wrote the book Bonk, which is a peek into the weird and wonderful world of sex research. It's received all sorts of accolades and made many top ten book lists. From the book's homepage:
The study of sexual physiology—what happens, and why, and how to make it happen better—has been going on for centuries, behind the closed doors of laboratories, brothels, Alfred Kinsey's attic, and, more recently, MRI centers, pig farms, and sex-toy R&D labs. I spent two years wheedling and conniving my way behind those doors to bring you the answers to the questions Dr. Ruth never asked. Is your penis three inches longer than you think? Is vaginal orgasm a myth? Can a dead man get an erection? Why doesn't Viagra help women—or, for that matter, pandas?
More here.