Zhana Vrangalova, Ph D, an adjunct professor of psychology at NYU who studies both nonmonogamous relationships and casual sex, believes that some of this depends on the type of relationship.
When the guy she was hoping to eventually marry broke up with her, Sophie was blindsided. Both were into something open, but they were in love, so they decided to proceed with their relationship as primary partners.
There are other ways to be monogamish, but those are the main ones.
And there's overlap in those definitions because that's the point: This is people making it up as they go along so that their relationships stay fulfilling. Terri Conley, Ph D, an associate professor at the University of Michigan and prominent researcher in the field of consensual nonmonogamy, has found in her research that up to 5 percent of people may be in some sort of nonmonogamous relationship.
They don't like to go into too many details afterward.
Sometimes Luke will go out and hook up with someone he met, and Sophie will stay home in their apartment, happy as a clam, watching old episodes of .