Becoming Orgasmic by Julia R. Heiman, Leslie Lo Piccolo, Joseph Lopiccolo, published by Piatkus Books (1988) [Buy]
A sexual and personal growth program for women.
ISBN 0861887980

The Multi-Orgasmic Couple: Sexual Secrets Every Couple Should Know by Mantak Chia, Maneewan Chia, Douglas Abrams and Rachel Carlton Abrams, published by HarperOne [Buy]
This book contains a series of exercises rooted in the Taoist sexuality tradition to help couples to learn a deeper sensitivity to their individual sexual energy and how to cultivate the flow of sexual energy between each other.
ISBN 0062516140

The Multi-Orgasmic Man: Sexual Secrets Every Man Should Know by Mantak Chia [Buy]
We refer people to this book as a resource for shortening the period between ejaculations. It has helped many men.
ISBN 0062513362

The Multi-Orgasmic Woman: Sexual Secrets Every Woman Should Know by Mantak Chia and Rachel Carlton Abrams, published by Rodale Books [Buy]
The authors combine their knowledge of Taoist sexuality tradition and Western medical research in a program of exercises designed to teach women to increase the length, intensity, and number of their orgasms.
ISBN 1594864853

The-Clitoris.com
A site dedicated to women’s sexual pleasure and health, with an emphasis on pleasure anatomy.
http://the-clitoris.com/