Some, like writer Hanna Rosin, see hookup culture as a boon: “The hookup culture is …bound up with everything that’s fabulous about being a young woman in 2012—the freedom, the confidence.” But others lament the way the extreme casualness of sex in the age of Tinder leaves many women feeling de-valued.

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As the polar ice caps melt and the earth churns through the Sixth Extinction, another unprecedented phenomenon is taking place, in the realm of sex.

Hookup culture, which has been percolating for about a hundred years, has collided with dating apps, which have acted like a wayward meteor on the now dinosaur-like rituals of courtship.

They are Dan, Alex, and Marty, budding investment bankers at the same financial firm, which recruited Alex and Marty straight from an Ivy League campus.

When asked if they’ve been arranging dates on the apps they’ve been swiping at, all say not one date, but two or three: “You can’t be stuck in one lane …

In February, one study reported there were nearly 100 million people—perhaps 50 million on Tinder alone—using their phones as a sort of all-day, every-day, handheld singles club, where they might find a sex partner as easily as they’d find a cheap flight to Florida.

“It’s like ordering Seamless,” says Dan, the investment banker, referring to the online food-delivery service.

“It’s changing so much about the way we act both romantically and sexually,” Garcia says.

“It is unprecedented from an evolutionary standpoint.” As soon as people could go online they were using it as a way to find partners to date and have sex with.

“I always make a point of disclosing I’m not looking for anything serious.

I just wanna hang out, be friends, see what happens …

It’s a balmy night in Manhattan’s financial district, and at a sports bar called Stout, everyone is Tindering.