In our Love App-tually series, Mashable shines a light into the foggy world of online dating. It is cuffing season after all. One in five Americans have engaged in consensual non-monogamy. And yet, there are no good dating apps for non-monogamous people. To clarify, there are a number of terms to describe different relationships involving more than two people. There is no one way to be non-monogamous or polyamorous; here is a primer with different terms and types of more-than-two relationships. Some people are in romantic partnerships with one person and sexual partnerships with others; some are in romantic and sexual partnerships with more than one partner — every non-monogamous relationship is unique.