"sex; teenagers." . . . . . . . . . . . "Discusses the processes of human intercourse and reproduction, the changes in the body during puberty, and the social, emotional, and physical problems these changes may cause." . . "Sex and the young teenager"@en . "Sex and the young teenager" . "Qing shao nian dui xing de ren shi = Sex and the young teenager" . . . . . . "Sex and the young teen-ager" . . . .