The sex-tonight hookup app, Tinder, launched more than a decade ago in 2012 and became an immediate sensation. After just two years, it was attracting more than 1 billion visits a day, with 90 percent of users being young adults.

Tinder arrived with seductive hype: Forget sexual caution. Forget getting to know people in all their psychological complexity. Just join, tap, and get ready to undress.

On social media, breathless users declared how easy it was to meet prospective sex partners, and that after a drink or three, sex was almost guaranteed. Tinder’s remarkable success quickly spawned other hookup apps such as Bumble, Hinge, Feeld, and, for folks identifying as LGBT , Grindr.

But if hookup apps ever delivered easy sex, is that still the case? Compared with nonusers, do today's users actually gain more sex? A recent large, rigorous survey shows they do not. The apps actually work better for traditional

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