Emergency contraception use in teen girls is on the rise, according to a Centers for Disease Control report released Wednesday, with one in five having used the morning after pill. The use of the morning after pill by teenage females has increased by 14 percent since 2002, according to the report that analyzed sexual activity, contraceptive use and childbearing for teenagers ages 15 to 19. The report interviewed about 2,000 males and females. Emergency contraception is available for purchase to all women of child-bearing age without a prescription now, which is likely the cause of the climb, reported USA Today. Overall reports of having sexual intercourse at least once for male and female teenagers has decreased since 1988, according to the U.S. Food and Drug Administration. Experts believe a decline in teenage sexual activity and better contraceptive use has lead to a decrease in teenage birth rates since 1991, the Star Tribune said. The report said teenage birth rates dropped 57 percent since 1991.