The display of affection in romantic relationships and its concomitants still require more scientific attention. Despite some studies addressing the topic of affection display, the literature does not provide a psychometrically reliable self-descriptive tool to measure this construct. Therefore, we conducted three studies among Polish adults to develop and validate a psychological tool for comprehensively identifying and measuring the display of emotional affection. Study 1 ( N = 894) aimed to develop and validate the Public and Private Romantic Display of Affection Scale (PPRDAS). It proved to be a valid psychological scale, as the theoretically assumed structure was supported by the results of the empirical analysis. Study 2 ( N = 343) confirmed the convergence validity of the PPRDAS using items of emotional expression from the Dyadic Adjustment Scale (Spanier, 1989). In Study 3 ( N = 204 couples), we further verified the external validity of the PPRDAS using an assessment of affection displayed by one's partner in the relationship. Individuals’ self-estimates of their private and public displays of affection were confirmed by their romantic partners. In all studies, display of feelings was positively correlated with sexual and relationship satisfaction. Negative correlations with age and the duration of the romantic relationship were also observed.