Pre-marital relationships among adults have a great influence on changing their attitudes toward marriage and family formation, and this change in attitude can make changes in the family’s structure, including the  rising  age of marriage, pessimism and distrust towards the opposite gender, the formation of new patterns of communication with the opposite gender, etc. Therefore, the purpose of this paper is to investigate the social backgrounds affecting the tendency towards premarital intimate relationships with the opposite gender among women. The research method is qualitative. Deep interview technique was used for collecting data. By using purposive and snowball sampling and the theoretical saturation, 17 dormitory female students in Urmia city were studied. For analyzing data, thematic analysis and coding were used. Findings indicated that there was a significant relationship between the goals/reasons that girls had in their minds and their tendency toward such relationships. For example, some girls find the opposite gender to be true if it is intended for marriage, and some tend to have such relationships in order to gain experience and knowledge before marriage, and others to respond to feelings or transient needs. Findings indicated that for most participants, emotional and sexual need, fear of being single as individual issues, and impact of social networks and peer pressure and reduction of family monitoring, changing attitudes and values ​​were the social determinants of their attitude towards the opposite gender.