This would account for about one-third of the overall decline in teen births in the United States during that period , researchers Melissa Kearney and Phillip Levine concluded . MTV 's ` ` 18 and Up '' shows encourage teens to use birth control . Teen births in the United States have been steadily declining since 1991 . Part of the decline can be attributed to the Internet , expert says .
MTV 's ` ` 18 and Up '' shows encourage teens to use birth control . Teen births in the United States have been steadily declining since 1991 . Part of the decline can be attributed to the Internet , expert says .