Capturing the multiple aspects of the romantic peer context is a significant challenge for research. One often recommended option is to use reports of multiple relationship features from both members of the romantic dyad. Using a new measure, we extended an existing model of dyadic perception (Kenny & Acitelli, 2001) to investigate associations between couples' (N = 148) reports about the positive and negative dimensions of their romantic relationships. Differences by participant age and relationship length were examined to test developmental hypotheses, and attachment and well-being were examined as correlates of participants' romantic perceptions. Agreement between partners was low, but associations of individuals' reports about themselves and their partners were high (projection). Agreement about negative romantic behaviors was higher in older compared to younger individuals and agreement about positive behaviors was higher in longer compared to shorter relationships. Partner similarity in negative behavior was higher than similarity in positive behavior. Individuals with better well-being reported more positive romantic behaviors, and attachment security was associated in some cases. Males were more negative about romantic behaviors than females, but there was no gender difference in agreement or projection. (Contains 1 figure and 3 tables.)