Teen sex not bad for grades.

Especially if the teen sex is with a teacher. From ABC News:

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.

It's not so much whether a teen has sex that determines academic success, the researchers say, but the type of sexual relationship they're engaged in. Teens in serious relationships may find social and emotional support in their sex partners, reducing their anxiety and stress levels in life and in school.