Self-efficacy in sexual communication is essential for open conversations about sexual topics with partners, children, or medical providers. The Sexual Communication Self-Efficacy Scale was developed (SCSES) and validated in the Polish women population by analysing its reliability, validity, and factor structure. 204 Polish-speaking adult women were recruited to validate the tool. The reliability coefficient Cronbach's, exploratory, and confirmatory factor analysis were performed. Moreover, the factor structure was investigated by combining it with the short version of the Female Sexual Function Index (FSFI-6). The adaption of SCSES in the Polish women population revealed the five-factor structure of the tool. The reliability was α = 0.976.The construct validity was confirmed. The results showed a significant, positive, moderate correlation between FSFI scores in all SCSES subscales and its total score r = {0.439; 0.534}. Moreover, the education level and place of residence differentiated the SCSES scores. The SCSES is a valid and reliable tool for the Polish women population. The findings highlight the need of recognising the importance of sexual communication in sexual functioning. [ABSTRACT FROM AUTHOR]