48 - Betty Dodson & Carlin Ross

Betty Dodson is a well-known pioneer in women's sexual liberation, having sold more than 1 million copies of her first book, Sex for One. Much of her fame has come from her work not only advocating masturbation, but conducting workshops for more than 30 years in which groups of about 10 or more women (and at least once a group of men) would talk, explore their own bodies, and masturbate together. She is a founder of the pro-sex feminist movement, having left behind the more traditional feminist movement because she considered it banal, antisexual and over-politicized.