When the men are outnumbered …

Here's a question for your next cocktail party: Do women civilize men?

To your average feminist, that's an archaic and sexist notion — maybe even a ploy to bridle women into unfulfilling monogamous relationships.

But it's a question worth asking, especially when considering the findings of Jon Birger, a Fortune magazine writer, who dug into the data about gender imbalances on college campuses and emerged with some interesting findings about their impact on social and sexual behavior.

Birger has just published a book, "Date-onomics: How Dating Became a Lopsided Numbers Game," in which he explains how an oversupply of women can and often does lead to their devaluation by males.

And there is nowhere better to study the impact of a female surplus on society than on college campuses, where women increasingly dominate the population.

A few decades ago, women fought for equal representation at institutions of higher learning. Today, women are more likely to hold a college degree than their male counterparts.

In 1994, male and female high school graduates enrolled in college at roughly the same rate.

This disparity has a plethora of socioeconomic implications that warrant further exploration, but for our purposes we'll focus on one element of the research.

Birger posits that this gender imbalance contributes significantly to the hookup culture that permeates campus life, which makes complete sense.

Comfortable in the minority, many college men today find themselves with seemingly limitless dating opportunities. And as the "in-demand" gender, men can be not only choosy, but brutally promiscuous when it comes to encounters with coeds.

An interview with a male student at Sarah Lawrence University, where women outnumber men 4:1, perfectly captured this phenomenon. The student copped to sleeping with more than 20 female peers.

"Sometimes it feels like you can have anyone you want," he said.

Skeptics might argue that campus hookup culture is a universal feature of modern college life, that men and women are acting as they would in any similar environment.

Not so, says Birger, who also looked at schools with more balanced gender ratios and those with disproportionately higher numbers of men.

At those universities, he found a propensity for traditional dating and monogamy, especially after freshman year.

What's even more interesting, and somewhat troubling, about Birger's research is what appears to be a correlation between gender imbalance on campus and sexual violence.

The narrative that universities foster a culture of rape has exploded. And while there are numerous good reasons and plenty of credible research to counter the questionable underlying data, there isn't an abundance of data or analysis on the potential causes of this alleged phenomenon.

When women are in abundant supply, there is reason to believe they are more likely to become victims of sexual assault.

The notion defies logic. Statistically, men, not women, are more likely to commit assault, and with fewer of them present, sexual violence should theoretically decrease. Similarly, women tend to find safety in numbers.

But a bounty of research shows that sexual assaults are more prevalent in communities where females outnumber the males.

Birger points to research by a Columbia University scholar who found that in China, where the opposite is true — men outnumber women by 20 percent — overall crime rates have risen with the tide of the male population, but rapes have declined dramatically. The idea being that, when women are scarce, they are better treated and men are more protective of them.

Another comprehensive look at the data by the Anthropology Department at the University of California, Davis, also found an oversupply of males is associated with lower rates of rape, although some research suggests an uptick in intimate partner violence.