A.A. co-founder Bill Wilson’s “philandering was an open secret. In the 1960s longtime A.A.’s became so alarmed by his constant attention to young female newcomers, they formed what they called ‘Founder’s Watch,’ a group of friends delegated to steer Bill away from pretty women who caught his eye during functions,” writes Gabrielle Glaser, author of Her Best Kept Secret: Why Women Drink and How They Can Regain Control. 
1. To carry on a sexual affair, especially an extramarital affair, with a woman one cannot or does not intend to marry. Used of a man.
2. To engage in many love affairs, especially with a frivolous or casual attitude. Used of a man. (freedictionary.com)
“Though he could not know it,” writes Glaser, “the early tolerance for Bill’s sexual conduct would set a behavioral precedent for [Alcoholics Anonymous].” 
Wilson’s last A.A. mistress was Helen W., and the affair lasted 15 years. Although Wilson’s wife Lois remained married to him through years of alcoholism and decades of adultery, Wilson nevertheless arranged that after his death, Helen W. would receive a percentage of the royalties from sales of Wilson’s A.A. books. 
1. Gabrielle Glaser, Her Best Kept Secret: Why Women Drink and How They Can Regain Control, Chapter 4