But surrounded by so many other successful women, they often find it harder than expected to find a date on a Friday night.

“My parents think there is something wrong with me because I don’t have a boyfriend, and I don’t hang out with a lot of guys,” said Ms. Andrew, who had a large circle of male friends in high school.

Jayne Dallas, a senior studying advertising who was seated across the table, grumbled that the population of male undergraduates was even smaller when you looked at it as a dating pool. “Out of that 40 percent, there are maybe 20 percent that we would consider, and out of those 20, 10 have girlfriends, so all the girls are fighting over that other 10 percent,” she said.

Needless to say, this puts guys in a position to play the field, and tends to mean that even the ones willing to make a commitment come with storied romantic histories. Rachel Sasser, a senior history major at the table, said that before she and her boyfriend started dating, he had “hooked up with a least five of my friends in my sorority — that I know of.”

These sorts of romantic complications are hardly confined to North Carolina, an academically rigorous school where most students spend more time studying than socializing. The gender imbalance is also pronounced at some private colleges, such as New York University and Lewis & Clark in Portland, Ore., and large public universities in states like California, Florida and Georgia. The College of Charleston, a public liberal arts college in South Carolina, is 66 percent female. Some women at the University of Vermont, with an undergraduate body that is 55 percent female, sardonically refer to their college town, Burlington, as “Girlington.”