More Women Are Using The Most Effective Contraceptive, And Numbers Will Likely Keep Rising | The number of women using intrauterine devices (IUDs) as a form of birth control has doubled in just two years, according to a new study from the Guttmacher Institute, from 4 percent to 8.5 percent. Since one of the biggest barriers to IUD use is cost, that number will likely continue to climb as the full cost of IUDs will soon be covered by insurance companies thanks to the Affordable Care Act. All types, but not all brands, of the device and other contraceptives will be covered. Along with the high costs, IUDs, which are the most effective and long-lasting forms of birth control, have also been relatively unpopular in the United States because of mass confusion about potential for infection and infertility. While those risks are actually incredibly low, 30 percent of health care providers still believe that IUDs are dangerous.