Thirdly, women were seeking new professional roles in society which could only be accomplished by limiting family size. Fourthly, the 20th century saw a change in sexual morality within which premarital sex was more tolerated, thus making effective birth control a necessity. Fifthly was the continued concern over differential fertility spurred on by the new interest in eugenics, or how to breed a truer American society. Even President Teddy Roosevelt tried to encourage native-born White Protestant American women to improve the nation's stock, as he stated: (quote, Fryer, p. l99). Finally, within the medical profession some doctors saw the need to develop an effective form of birth control and to monopolize this area of health care, least women fall victim to quacks and irregular medical sects who still performed abortions.