Teenage pregnancy (defined as pregnancies occurring in women aged 19 or under[1]) is a big public health problem worldwide. According to the United Nations report,among 132 million babies bom worldwide each year, about 14 million babies (10.6 %) are born to adolescent mothers[2]. In Britain, teenage pregnancy has been labeled alongside cardiovascular disease, cancer and mental health as major public health problem[3]. The Nordic Resolution on Adolescent Sexual Health and Rights counts as a measure of public health success the fact that the numbers of teenage pregnancies in the Nordic countries are among the lowest in the world[4]. Maybe the study designs and samples are different, and they may not represent adolescents as a whole, but they do give us some hint for the general trend of sexual behaviors of adolescents all around the world.