LOS ANGELES There’s good news for parents who worry that their teenagers’ sex lives are affecting their school performance: A provocative new study has found that teens in committed relationships do no better or worse in school than those who don’t have sex.

The same isn’t true for teens who “hook up.” Researchers found that those who have casual flings get lower grades and have more school-related problems compared with those who abstain.

The findings, presented Sunday at a meeting of the American Sociological Association in Atlanta, challenge to some extent assumptions that sexually active teens tend to do poorer in school.

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