Study Debunks Theory On Teen Sex, Delinquency
New Analyses Challenging Many Old Assumptions
Sunday, November 11, 2007; Page A03
Researchers at Ohio State University garnered little attention in February when they found that youngsters who lose their virginity earlier than their peers are more likely to become juvenile delinquents. So obvious and well established was the contribution of early sex to later delinquency that the idea was already part of the required curriculum for federal "abstinence only" programs.
There was just one problem: It is probably not true. Other things being equal, a more probing study has found, youngsters who have consensual sex in their early-teen or even preteen years are, if anything, less likely to engage in delinquent behavior later on.
That new analysis, a reworking of the same data the Ohio team used, is one of several recent instances in which a more precise parsing of data has begun to turn long-standing societal presumptions on their head. By bringing evidence to bear on complex social issues, these studies are forcing individuals and policymakers to rethink such hot-button topics as the benefits of breast-feeding, the risks of teen child-bearing and, in the latest example, the harms long presumed to result from teen sex.
Like many of the newer studies, the latest one -- led by Paige Harden, a doctoral candidate in psychology at the University of Virginia in Charlottesville -- used the powerful techniques of behavioral genetics. The field specializes in studies on twins, research that can help tell whether behavioral traits are the result of genes or the social environment, and that has periodically stirred controversy when it has focused on the genetic underpinnings of criminality and intelligence.
But the specialty's analytic methods can also help tell whether one behavior, such as early sex, is merely correlated with or actually causes a second behavior that is often found with it, such as delinquency. If two behaviors often exist in the same people but are found not to be connected by cause and effect, then a third factor is likely to be causing both.
That kind of finding can help identify better targets for prevention efforts, experts say.
"Behavioral geneticists have long sought to establish causal links between genes and complex behaviors. So it's fascinating to see them use the tools of their trade to dispute widely held beliefs" about the social roots of some of those behaviors, said Erik Parens, a senior research scholar who has tracked the field intensively at the Hastings Center, a Garrison, N.Y., science and ethics think tank.
The latest example started when Dana Haynie, a sociologist at Ohio State, and her then-graduate student, Stacy Armour, published a study in February in the Journal of Youth and Adolescence. They analyzed data collected from more than 7,000 children as part of the National Longitudinal Study of Adolescent Health, a federally funded survey that in 1994 began gathering information about the health-related behavior of U.S. schoolchildren who were then in grades seven through 12.
Haynie and Armour divided the children into three groups based on when they first had sex: when they were younger, about the same age or older than the age at which most of their local peers lost their virginity. (It varies by region, but on average, U.S. children lose their virginity at age 16.) They also compiled information on graffiti-painting, shoplifting, drug-selling and other "problem behaviors" by those young people in later years.
Their conclusion: One year after losing their virginity, children in the early category were 20 percent more likely than those who started having sex at the average age to engage in delinquent behavior, even when several other relevant factors such as wealth, race, parental involvement and physical development were taken into account.
Those findings supported the widely held notion that loss of virginity at a relatively young age appears to, as Haynie and Armour wrote, "open the doorway to problem behaviors."
Harden, at the University of Virginia, didn't believe it.