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Bullying is a serious problem that impacts hundreds of millions of young people across the world each year. the goal-directed, harmful abuse of a power imbalance, bullying can cause serious, .

As a result, countries around the world have mobilized . Unfortunately, these efforts have had .

Why? One reason might be that bullying is, at least in part, that offers adolescent perpetrators benefits, like popularity, resources and even dates and sex.

But do these benefits extend beyond adolescence? This is what we set out to test at . In particular, we wanted to know if the earlier and more frequent dating and sex that adolescent bullies experienced translated into having more children in later life.

An evolutionary trait?

There is very little data on whether bullying benefits like popularity or sex extend beyond adolescence, but suggested that might be the case. We sought to replicate that research using two studies.

The first was a longitudinal study of adolescents: approximately 600 Canadian boys and girls from age 14 until their mid-20s. The second was a retrospective study of more than 500 North American adults ages 18–35. , compared to adolescents who did not engage in bullying.

While we note that a complete study should entail following adults into their mid-40s (the very end of most child births), we wanted to compile data now rather than waiting another 15–20 years for our longitudinal sample to mature. That means that while we can't rule out that non-bullies might catch up with later reproduction, the data clearly shows that onset of reproduction is tied closely to total reproduction.

Is having children early, and more often, a good thing? Given that bullying does appear to be partly due to evolved genetics (with the environment still playing a pivotal role in its expression), reproduction is the ultimate currency of evolution. Passing on genes is, quite literally, . So this is strong evidence for the theory that bullying is, at least in part, an evolutionarily successful strategy in some contexts.

Socially, bullies are also more likely to be in the romantic relationship that is typically required to have children. We believe this is because bully's power is related to , like attractiveness, strength and even social skills.

Our yet-to-be published data also indicates that former bullies end up investing more energy into their children than average parents. Think of the hockey or soccer parents yelling on the sidelines, bullying their child's coach, referees or other players in order to benefit their own child. Bullying's links with parenting go beyond purely quantitative considerations and impact both mating success and parental effort.

Why does this matter?

It matters because it helps explain why bullying is so ubiquitous and hard to prevent. Bullying appears to offer meaningful benefits to those who use it and that's critical information if parents, teachers, schools and governments want to come up with strategies for preventing it.

What might some of those strategies look like? If bullying offers benefits, we want to reduce, replace and redirect those benefits. We can do so by getting with the attention and popularity that they desire. We can replace benefits with costs by pointing out that while bullies gain popularity, . People might fear the bully's power, but they generally don't like them.

Finally, we can try to teach adolescents to that might have equal or better outcomes with respect to peer support.

This also matters because our data shows bullying as a potentially intergenerational problem. We know that . It is possible that children of bullies will learn how to be bullies themselves, through directly experiencing bullying from their parents or through indirectly watching their parents bully others.

This generational transmission might very well be another reason why bullying is so hard to prevent—because it starts in the home. Given the seriousness of the consequences of bullying for its victims, we must all to take a good, hard look at why so many people continue to bully, or support bullies, so that we can understand how we to best stop this toxic and damaging pattern of behavior.