In this undated image provided by Merck, a model holds a Nexplanon birth control hormonal implant. In a report released Tuesday, Feb. 24, 2015 by the Centers for Disease Control and Prevention, long-acting but reversible methods of birth control are becoming increasingly popular among U.S. women, with IUDs redesigned after safety scares and the development of under-the-skin hormone implants. (AP Photo/Merck)
