Sexualities 2017, Vol. 20(1–2) 86–104 ! The Author(s) 2016 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav DOI: 10.1177/1363460716649337 sex.sagepub.com Article Examining relationship quality across three types of relationship agreements Le´a J Se´ guin Universite´ du Que´bec a` Montre´al (UQA ` M), Canada Martin Blais Universite´ du Que´bec a` Montre´al (UQA ` M), Canada Marie-France Goyer Universite´ du Que´bec a` Montre´al (UQA ` M), Canada Barry D Adam University of Windsor, Canada Francine Lavoie Universite´ Laval, Canada Carl Rodrigue Universite´ du Que´bec a` Montre´al (UQA ` M), Canada Ce´ line Magontier Universite´ du Que´bec a` Montre´al (UQA ` M), Canada Abstract While past studies have measured several indicators of relationship quality in relation to types of relationship agreement, most have not included polyamorous relationships, and have almost exclusively included samples of gay men. The purpose of this study was to address this gap by examining five dimensions of relationship quality and eight dimen- sions of relationship equity in a sexually diverse Canadian sample (N ¼ 3463) across three types of relationship agreements (monogamous, open, and polyamorous). The data were collected online as part of a larger study. In order to compare relationship types on relationship dimensions, MANCOVAs were computed using age, relationship Corresponding author: Le´a Jeanne Se´guin, Universite´ du Que´bec a` Montre´al, 455 Rene´ Levesque Est, room W-R110, Montreal, QC Quebec H2L 4Y2, Canada. Email: seguin.lea@courrier.uqam.ca