Nicola Prentis finds that men seeking open relationships are more honest about what they want.Nicola PrentisNicola Prentis sees a green flag when a guy's online dating profile lists him as non-monogamous.She finds these men to be honest and great at communication.Prentis has found that dating non-monogamous men raises the bar for what good relationships should be like.The first time I dated a non-monogamous man was in 2012.