One in five US adolescents has sex before turning 15TEENAGE LUST: Experts say that the report should be a wake-up call to parents and teachers that education needs to start earlier because kids are way ahead of themNY TIMES NEWS SERVICEWednesday, May 21, 2003,Page 7 About 20 percent of adolescents in the US have had sexual intercourse before their 15th birthday -- and one in seven of the sexually experienced 14-year-old girls has been pregnant, according to a new report released on Monday by the National Campaign to Prevent Teen Pregnancy. The report, an analysis of seven studies conducted in...