The Complete Idiot’s Guide to the Kama Sutra

This book combines two cultural icons between its covers: the Kama Sutra, a near-mythic guide to sex, and the increasingly ubiquitous "Complete Idiot's Guide to..." series.
To see an ancient spiritual guide to sex broken down into a pop-culture format, complete with clip-art and bullet-points, is kind of odd, but this actually works surprisingly well.
By moving the Kama Sutra into the modern age, the book makes the text far more accessible, and moves the concept of the Kama Sutra from something dirty to a practical guide to enhanced sexual enjoyment.
The book features a comprehensive guide to both the male and the female body from a sexual standpoint, and of course has the famous list of positions diagrammed in all their glory. There is also lots of discussion about the spiritual component of sex, and the book serves an added function as a relationship-helper outside of the bedroom. By attuning yourself to your partner's needs, you're certain to become a better lover.
But aspiring Casanovas should beware: there's no checklist of tips that are going to make you a stud/studette. The book has all the knowledge you require to achieve that end, but you might be disappointed at how much you have to work to get there (and how common-sense much of the advice is).
If you're not a spiritual person, you can still take lots of the sensual advice to heart, and rest assured that you and your partner are going to be a lot better off in the sack if you discuss the ideas that this book presents.