Introduction: It seems that friendly relationships with the opposite sex among boys and girls have meanings, dimensions, effects, and different outcomes. This article aims to investigate the gender of this phenomenon with emphasis on perceptions and motives, consequences, and modeling. This phenomenon among boys and girls is studied on the students of Kharazmi University. Method: The research approach of present study was qualitative, and research method was based on phenomenology. The participants of the study consisted of two groups of male and female students at B.A. and M.A. levels from Kharazmi University. By applying a purposeful sampling method and snowballing strategy, a deep semi-structured interview was conducted with 15 female students and 15 male students, having theoretical saturation criterion in mind for reaching a sample size. Findings: Male and female students have different experiences and understanding of relationship with the opposite sex, and they enter the relationship with distinct motivations. The most noted characteristics in female students include displaying false self and immersion in romance. In male students, these characteristics include instability, and non-commitment in relationship, lack of real representation, preparation for instability of relationships, and awareness of the relations of absurdity. Discussion: The findings show that girls are more likely to seek emotional and long-term relationships and marriage, on the other hand, the male students are more after pleasurable and sexual relationships. Expended AbstractIntroduction :The friendship of college students with the opposite sex and its increasing growth at the level of the universities of the country has now emerged as a transpersonal phenomenon and has found a family and societal dimensions. It seems that friendly relationships with the opposite sex among boys and girls have different meanings, dimensions, effects, and outcomes. Girls and boys have relationships with one another with different motives -making choice for proper marriage, curiosity and other cognition, and temporary friendships that can be merely an emotional relationship or for meeting the sexual needs. Huge difference between social, religious and family norms with the values and attitudes of the modern world and the everyday experiences of young people have resulted in contradiction among them. On the one hand, instinctive pressures and tensions tend to turn young people toward the opposite sex, and on the other hand, sociocultural and moral considerations have acted as obstacles. This contradictory situation has always been a complicated issue for adolescents and young people, as well as families and authorities, and has created an uncertain status in terms of how to deal with this issue. Since the family is the first small community that a person experiences, his influence and support, up to the age of 15, and more during childhood, are direct and intense. In adolescents and young people who enter environments such as high school and university, t...