Growing pattern of premarital dating and friendship, together with transformation in the gender structure of Iranian universities are two emerging socio-cultural phenomena. In this paper, we examine the intersection of these two phenomena among university students. Based on Blau's theory, we hypothesize  that as gender heterogeneity in classrooms increases, the contact chance within the members of minority gender groups decrease and on the contrary, friendship among the members of the majority gender group increase.The findings of a survey conducted among 425 students from Shiraz University, supported Blau's theory, indicate that gender heterogeneity in classrooms provide greater opportunity for interaction with the members of opposite-sex. In the case of female students, these findings should be interpreted cautiously however. Results also suggest that individual attitude has explained variance of the dependent variable more than gender heterogeneity. Although both objective macro structures and subjective micro structures affect social relations, the latter has more immediate influences.

Physicians Believe that physical readiness is a proper Ground for obtaining Desirable mental condtions. On this Basis the Aim of This Reasearch Has Been compare mental health of athlete and non-athlete boy students in zahedan medical science university .In this discriptive analitical research, concerining the maximum athlete people, 70 athlete boy students Were selected. 70 non-athlete students having the same demographic conditions of athletes were selected from the students of zahedan medical sciences university by the way of personal similarization. The mean age of the boy students in this study was 24/24 yaers. Mental health of the selected students was considered arid compared by the use of general health questionnaire including 28 questions (GHQ-28). The results showed that there is a meaningful difference among mental health of athlete and non athlete boy students. The mean rate of mental health of athlete in this study was (X1=16.13) and non-athlete was (X2=28.700).The observed difference was meaninigful in Level (p<0.05) and has shown the better situation of mental health of athlete boys incomparing with non-athlete.

Regarding the everyday the increase of psychological disorders in today's societies which have wretched consequences, this research tries to analyze and compare mental health of Sanadaj high schools, athletic and non-athletic male students in Sanadaj high schools. In this research, 406 boy students have been chosen by Clustering random sample, of whom 202 were non-athletic and 204 were athletic (106 person in collection courses and 98 person in single courses). For measuring students’ mental health, a general health questionnaire with 28 questions was used. Results showed great differences in athletic and non-athletic students regarding mental health, somatic symptoms, anxiety and sleep disorders, social function and depression (P £ 0.05) and showed the better situation of athletic students, in all mentioned areas, in comparison with non-athletic students. Also no differences have been observed between, collection and single courses sportsman’s mental health (P£0.05). Likewise no special relation appeared between mental health and athletics’ sport precedence (P£ 0.05).