Glenn Harlan Reynolds explores that question in this piece on TCSDaily.
Reynolds suggests that the answer may be “that men aren’t so much underrepresented in college as women are overrepresented. This is plausible. There probably are too many people going to college in general, and it may be that men — more likely to choose, or at least consider, high-paying but unfeminine alternatives like plumbing, or other, more ‘masculine’ alternatives like military service — are less likely to wind up in college as an unthinking extension of high school.”
I particularly like the phrase “an unthinking extension of high school.”
Last year, I suggested pretty much the same thing here.
Reynolds suggests that congressional hearings into this supposed problem may be in the offing. It’s just the sort of thing that lends itself to political grandstanding, but knowing a bit about how hearings are usually conducted in Washington, I can’t imagine any good coming of it. And as I’ve said before, education is none of the federal government’s concern.
Recommended

Biden Signs Executive Order Allowing the U.S. to Fund Global Abortions
The policy was first instated by President Reagan to ensure that taxpayers would not be required to indirectly fund abortions in other countries.

The Absurd Criticism of Rand Paul’s Rachel Levine Questioning
How likely is it that this dangerous ideological agenda is about to get worse?

Exclusive: 48 Senators Promise to Oppose Any Bill that Funds Abortion
Pro-life lawmakers pledge to resist spending bills that don’t include the Hyde amendment.

Cruz: Actually, It Is Constitutional to Impeach and Convict a Former President
Never mind how he voted.

What Happened to Officer Sicknick?
Democratic impeachment managers have a duty to explain how Officer Sicknick died.

Minnesota Nasty
Minneapolis is a nice city no longer.
The Latest

The ‘Neanderthal Thinking’ of COVID Piety
The Left’s venomous attacks against Texas for lifting restrictions are more divisive than usual.

Deter Beijing from Attacking Taiwan
Policies to keep great-power competition from becoming great-power conflict.

Income Inequality Revisited
Does it matter, and why if so?

How to Secure Elections
Significant fraud is rare, but certain voting reforms are still needed.

Nomadland’s Frontier Spirit
Zhao’s gorgeous, melancholy film makes the nomad life seem like it admits of multiple interpretations, which capture different true things.

Trump Blames McConnell, Kemp for Loss of Georgia Senate Seats
Trump blamed the Georgia loss on McConnell's refusal to back $2,000 COVID stimulus checks.