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 `` 16 and Pregnant '' may 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 recession , expert says .