"A number of polls have cited women’s opinions about the frequency of preferred menstrual bleeding. Some polls suggest that up to half of women may prefer a menstrual frequency of “never”, although the acceptability of amenorrhea has cultural determinants and varies widely. An international study involving women in Nigeria, South Africa, Scotland, and the People’s Republic of China found that most women dislike menstruation, and in all of the countries studied except the People’s Republic of China, most women expressed a willingness to try a contraceptive method that induced amenorrhea."