STATISTICS, especially on a subject as intimate as sexuality, have a way of reducing humanity to faceless abstractions. In gathering material for this week's cover story on the sexual activities and attitudes of American teenagers, we concentrated on people rather than printouts. Our correspondents interviewed parents, school counselors and behaviorists, but the most fascinating stuff came, of course, from the scores of youngsters with whom our reporters talked.
"Teenagers still giggle, still take their social lives very, very seriously," says Correspondent Christopher Cory, who interviewed students at Tenafly (N.J.) Senior High School.
"But...