Extramarital relationships are considered as one of the most serious threats to the stability of marital relations and family functioning, one of the main reasons for divorce, and one of the most critical issues faced by families. Accordingly, the present study aimed to explore extramarital relationships in women and find out social and cultural factors affecting such relationships. Methods: This study was conducted qualitatively using a qualitative content analysis method. The data were

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... ed to the theoretical saturation point through semi-structured interviews with 34 women. Results: The analysis of the participants' experiences indicated that a set of cultural factors and major developments such as individualism, changing values ​​and promoting alternative values, the absence of an authentic relationship, facilitating effects of technology and social media, changing women's attitudes toward womanhood and its responsibilities, and diminution of religious and ideological beliefs play a role in the emergence and increase of extramarital relationships. Conclusion: The development of extramarital relationships in women is not just an individual phenomenon but a process influenced by many factors. Therefore, the role of cultural and social factors in the formation and increase of these relationships should not be underestimated.