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 dimensions of relationship equity in a sexually diverse Canadian sample (N = 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 duration, cohabitation status, sex, sexual orientation, and an interaction term of sex and sexual orientation as control variables. High scores of relationship quality and equity were reported by the overall sample, and scores on all scales did not significantly differ by types of relationship agreements. Overall, these results strongly suggest that these types of relationship agreements are equally healthy viable options.