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    Young Girls, Older Boyfriends & Sex

    Having an Older Boyfriend -- or a Serious Boyfriend at a Young Age -- May Raise a Girl's Risk of Early Sex

    Early 'Serious' Relationships

    And, "In seventh grade, about half of both males and females reported never having had a serious boyfriend or girlfriend," the researchers write.

    That means about half the students had had what they considered a serious relationship.

    Most of those students reported having relationships with people their own age. Of the boys who'd had a serious girlfriend, 47% said their girlfriend was their age. Among girls who'd had a serious boyfriend, 31% said their boyfriend was their age.

    When there was an age difference, girls were more likely to be the younger person. Eighteen percent of girls reported having had a boyfriend at least two years older than they were. About 6% of the boys reported having a girlfriend that much older than they.

    Sex by 9th Grade

    In the ninth-grade survey, students were asked, "Have you had sex in the last 12 months?" defining sex as a "man's penis in woman's vagina."

    Most students answered "no" to that question. But those who had had a serious relationship by seventh grade were more likely to report having sex in the year leading up to the survey.

    "One in 10 males and females who reported no relationship in seventh grade said that they had had sex in the 12 months before the ninth-grade interview, compared with at least one in five who reported in seventh grade having had a same-age or older girlfriend or boyfriend," write Marin and colleagues.

    The survey didn't ask students to identify their sexual partner or that partner's age. So the researchers don't know exactly when, or with whom, students started having sex.

    Boys, Girls & Age

    Among boys, those with a serious girlfriend by seventh grade were twice as likely to have had sex in the year before the ninth-grade survey -- compared with the girls, who were three times as likely.

    And while girls with a serious older boyfriend by seventh grade were twice as likely to have had sex as those who'd had a same-age boyfriend, no such pattern was seen between boys and older girlfriends. However, those couples were rare, which might make it hard to spot trends in that group.

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