During the last hundred years, women were led to believe much about reproductive health that was simply untrue. Young girls were taught that menstruation was unmentionable -- a curse. Pregnant women in labor were often told to put a knife under their bed to "cut the pain." In the early 1900s, birth control was illegal. Great controversy and debate over contraceptive use, even in marriage, existed. Learn about these 10 contraceptive myths.