Fixed gender roles began to become less prominent in the Western world starting in the late 20th century, allowing men to make their own choice of career without regard to traditional gender-based roles. Some men who choose this role may do so because they enjoy being an active part of their children's lives, while in other families, the mother wants to pursue her career. For example, of the 187 participants at "Fortune" magazine's Most Powerful Women in the Business Summit, one-third of the women's husbands were stay-at-home dads.