The paradigm has shifted. Dating is dated. Hooking up is here to stay.

(For those over 30 years old: hooking up is a casual sexual encounter with no expectation of future emotional commitment. Think of it as a one-night stand with someone you know.)

According to a report released this spring by Child Trends, a Washington research group, there are now more high school seniors saying that they never date than seniors who say that they date frequently. Apparently, it’s all about the hookup.

When I first heard about hooking up years ago, I figured that it was a fad that would soon fizzle. I was wrong. It seems to be becoming the norm.

I should point out that just because more young people seem to be hooking up instead of dating doesn’t mean that they’re having more sex (they’ve been having less, according to the Centers for Disease Control and Prevention ) or having sex with strangers (they’re more likely to hook up with a friend, according to a 2006 paper in the Journal of Adolescent Research).

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To help me understand this phenomenon, I called Kathleen Bogle, a professor at La Salle University in Philadelphia who has studied hooking up among college students and is the author of the 2008 book, “Hooking Up: Sex, Dating and Relationships on Campus.”

It turns out that everything is the opposite of what I remember. Under the old model, you dated a few times and, if you really liked the person, you might consider having sex. Under the new model, you hook up a few times and, if you really like the person, you might consider going on a date.