Abstract Previous research has consistently shown a close relationship of sexual health with the dynamics within a romantic relationship. However, most measurements in this field have traditionally focused solely on the individual level, thus neglecting relationship aspects. In the present study, we introduce a new theoretical framework and the Dyadic Sexual Self-Esteem Inventory (DSSEI) as a measurement tool designed to evaluate sexual self-esteem from an interpersonal perspective. Using data from individuals in monogamous relationships (N = 784), we conducted confirmatory factor analyses, tested measurement invariance, and assessed the instrument’s reliability and validity. The results demonstrate that the DSSEI is a reliable and valid 30-item tool that consists of one higher-order factor (Dyadic Sexual Self-Esteem), five second-order factors (Evaluation of the Self, Perceived Partner’s Influence on Self, Perceived Partner’s Self-Evaluation, Perceived Influence on Partner, Couple Evaluation) and ten first-order factors that differentiate between sexual self-worth and sexual self-efficacy within dyadic sexual self-esteem. The DSSEI exhibits partial scalar invariance across gender and measurement points for the second-order factors. Reliability analyses demonstrate good internal consistency and stability over time. The validity analyses incorporated Pearson product-moment correlations and regression analyses, revealing significant associations between dyadic sexual self-esteem and sexual self-esteem, sexual subjectivity, self-esteem, sexual function, sexual satisfaction, relationship satisfaction, and emotional intimacy. Additionally, the DSSEI differentiates between individuals with and without sexual dysfunction and between those with high and low relationship satisfaction. The DSSEI has implications for both sexual health research and clinical practice and adds to an understanding of couples’ sexual interactions as a product of their dyadic experiences rather than the sum of individual predispositions.
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