“Someone can have a fantastic date, but when they get an email [from a dating service] with three other matches,” says Maria Avgitidis, dating coach and founder of Agape Match in Midtown, “fear of missing out takes effect.” But it’s important that everyone is up front about dating other people.

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With Facebook, Twitter and some minor sleuthing, anyone can be tracked down.

“If you sleep with someone, there’s a good chance you’ll be able to contact them again [or vice versa],” says Manley.

While some might lament the loss of anonymity, Manley adds that this isn’t always such a bad thing.

With time, a no-strings hookup could turn into something more.

Foltz, 29, says it can be tricky, but that gender norms are still at play.

“I have a more masculine energy, so I usually pay on the first date,” she says.Last-minute offers used to mean you were a second choice, and the advice was to save face and your self-respect by saying, “Nope.” But with the ability to find a potential match now sped up to the nth degree, that rule has been turned on its head.“When I was on Tinder, you’d match, chat for 45 minutes, and then she’d be like, ‘Let’s go on a date tomorrow,’” Manley says. It saves you time figuring out if this is the right person.” Forget having a one-night stand and never seeing the person again.“There are definitely guys who would be really into a woman taking charge like that,” says Manley.The 1996 comedy “Swingers” popularized the idea that cool kids must wait three days to call a date after an encounter.“If you think you know the rules, some new app will come along and reinvent the rule book.” Here’s how to play the game now.