"“For the people who wanted to open their relationship and who did end up doing it, their satisfaction was significantly higher,” says Samantha Joel, assistant professor of social psychology at Western University in London, Canada. “Meanwhile, for the people who thought about it but didn't, their satisfaction dipped, but barely significantly.” Joel suggests that the uplift in satisfaction among people who switched to CNM might have been the result of a dragging effect. A better quality of sex life with a secondary partner drags up satisfaction with the primary partner, because suddenly the pressure of one person having to provide all of their enjoyment is removed. “We know that when people are happier with their sex life they communicate better anyway,” says Joel. “But people in CNM report having open communication – it is difficult to be CNM if you are not talking about boundaries. Whereas in monogamous couples, those discussions about boundaries often don’t happen.”"