A good web site about female sexuality, including anatomy (with pictures), female masturbation, sex toy reviews, and other sex topics
Very comprehensive site on male masturbation
Masturbation tips and techniques
Sex For One: The Joy of Selfloving by Betty Dodson, published by Three Rivers Press [Buy]
For more than 20 years, Betty Dodson has been dedicated to taking the shame out of masturbation, showing it to be a healthy form of sexual expression. With warmth and intelligence, and informative line drawings, Dodson explains how anyone can learn to fully enjoy the pleasures of self-love, pointing out that masturbation is still the safest sex.
A site dedicated to women’s sexual pleasure and health, with an emphasis on pleasure anatomy.