More people want open relationships, but many don't last. A sex researcher shares the 3 top reasons couples return to monogamy.

Non-monogamy comes with its own challenges, Dr. Justin R. Garcia, the executive director of the Kinsey Institute, told Business Insider. Hinterhaus Productions/Getty Images Dr. Justin R. Garcia, head of the Kinsey Institute, said non-monogamy has gotten more popular. However, he said open relationships and polyamory tend not to work for most people. Some find non-monogamy to be too much work in practice. Open relationships have gotten a cultural glow-up among younger adults. In practice, th...