Forty-five percent of adolescents ages 15-19 have had sexual intercourse. By age 19, 75% of all adolescents have had sexual intercourse. Most adolescents select condoms as their most reliable method of contraception. The United States continues to rank among the highest of all similarly developed countries in rates of adolescent pregnancy, and the unintended pregnancy rate is highest among women ages 20-24. The reasons for these public health statistics...