In 2012, 34 percent more women than men graduated from American colleges, and the U. Department of Education expects this gap to reach 47 percent by 2023.The imbalance has spilled over into the post-college dating scene. “I don’t get intimidated easily,” her profile warns. She likes “hockey, whiskey, swimming in an open ocean, down comforters, astronomy.” Her photos are striking: a wide-eyed close-up, overlit like an album cover; a low-res ­camera-phone shot that flaunts a short skirt and the gypsy tattoo that curls around her thigh.

Here’s the thing: This surplus of women is not just “perceived” but very, very real.

Given the shortage of young men in post-World War I Europe — 10 million soldiers died and 20 million were wounded, many grievously — Bernard wonders why any bachelor would want to settle down. Today’s hookup culture does have one big thing in common with the ’20s flapper generation, and that is demographics.

There are too many women and they’re all too easy to make it worthwhile.” I was reminded of this while reading Vanity Fair’s much-publicized piece, “Tinder and the Dating Apocalypse,” which naively blames today’s “hookup culture” on the popularity of a three-year-old dating app.

As I argue in “DATE-ONOMICS: How Dating Became a Lopsided Numbers Game,” the college and post-college hookup culture is a byproduct, not of Tinder or Facebook (another target of modern scolds), but of shifting demographics among the college-educated.

Much as the death toll of WWI caused a shortage of marriageable men in the 1920s, today’s widening gender gap in college enrollment has created unequal numbers in the post-college dating pool.