CHICAGO - An experimental abstinence-only program without a moralistic tone can delay teens from having sex, a provocative study found. Billed as the first rigorous research to show long-term success with an abstinence-only approach, the study differed from traditional programs that have lost federal and state support in recent years. Two years into the study, about one-third of abstinence-only students said they'd had sex since the classes ended, versus nearly half - about 49 percent - in each of the other three groups. The study was released Monday in the February edition of Archives of Pediatrics & Adolescent Medicine.

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