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In 2016, online dating is a venerable, boring institution that has lost both its geeky shame and its exotic appeal. Alas, there's one kind of app that's still foreign territory for most people: the group sex kind.

Right now, one of the biggest names among digitally-savvy swingers is called Feeld, as in "playing the field." It used to be called 3nder, pronounced "Thrinder," until a trademark infringement lawsuit from Tinder put an end to that.