Editing Homosociality (section)

== Empirical evidence ==
In a study presented by Rose,<ref>Rose, S.M. (1985). Same- and cross-sex friendships and the psychology of homosociality.  Sex Roles, 12(1/2), 63-75.</ref> males and females between the ages of 20 and 28 were examined on their evaluations of same- and cross-sex friendships. Results showed a preference for same-sex friendships in both men and women. [[Cross-sex friendship]]s were evaluated by men and women to be less helpful, and less loyal than same-sex friendships, and friendship formation was found to be different between cross-sex and same-sex friendships as well.

Depending on the culture, and family, and social structures, same-sex preferences have been found to develop between 3 and 9 years old. (LaFreniere, Strayer,& Gauthier, 1984; Jacklin& Maccoby, 1978; Harkness & Super, 1985).<ref>Harkness, S., & Super, C.M. (1985). The cultural context of gender segregation in children’s peer groups. Child Development, 56, 219-224.</ref><ref>Maccoby, E.E., & Jacklin, C.N. (1987). Gener segregation in childhood. Advances in Child Development and Behavior, 20, 239-287.</ref><ref>LaFreriere, P., Strayer, F.F., & Gauthier, R. (1984). The emergence of same-sex preferences among preschool peers: A developmental ethological perspective. Child Development, 55, 1958-1965.</ref> LaFreniere, Strayer, and Gauthier (1984)<ref>LaFreriere, P., Strayer, F.F., & Gauthier, R. (1984). The emergence of same-sex preferences among preschool peers: A developmental ethological perspective. Child Development, 55, 1958-1965.</ref> conducted a three-year-long study observing fifteen peer groups between the ages of 1 and 6 years old, 98 boys and 93 girls.  As they looked into sex segregation in childhood, the researchers found that segregation rose with age and that most Western children exhibit these preferences around 3–4 years old. However, in a study by Harkenss and Super,<ref>Harkness, S., & Super, C.M. (1985). The cultural context of gender segregation in children's peer groups. Child Development, 56, 219-224.</ref> Kenyan children were not found to have sex-preference in playmates until the ages of 6 to 9 years old. Researchers observed 152 Kenyan children in rural settings and found that this change didn't occur until parental expectations and customary duties increased.  "Just when and how such gender segregation appears, is the joint product of the individual and the culturally constructed niche" (Harkness & Super, 1985).<ref>Harkness, S., & Super, C.M. (1985). The cultural context of gender segregation in children's peer groups. Child Development, 56, 219-224.</ref>

It appears that the social bias towards members of one's own sex can develop early in children. Specifically, studies have found that by the early age of 3 or 4, children prefer members of their own sex to members of the opposite sex (Bussey & Bandura, 1992).<ref>Bussey, K., & Bandura, A. (1992). Self-regulatory mechanisms governing gender development. Child Development, 63, 1236-1250.</ref> That is, young girls favor other females (girls and women) over males (boys and men). The findings are identical for young boys. Moreover, a study done by Carol Martin (1989)<ref>Martin, C. L. (1989) Children's use of gender-related information in making social judgments. Developmental Psychology, 25, 80-88.</ref> found that boys 4.5 years of age expressed significantly more dislike for a girl depicted as a "[[tomboy]]" than a boy depicted as a "[[sissy]]"; whereas boys 8.5 years of age express more dislike for a boy depicted as a "sissy". This age difference suggests that children as young as 4 prefer their own sex regardless of gender-incongruent behavior. Around the age of 8 however, boys begin to adhere to and appreciate the social expectations for males—devaluing feminine behavior. It has also been shown that children ages 10–12 prefer same-sex socializing. That is, girls favored girls who socialized with other girls and boys liked boys who socialized with other boys.<ref>Lobel, T. E., Bempechat, J., Gewirtz, J. C., Shoken- Topaz, T., & Bashe, E. (1993). The role of gender-related information and self-endorsement traits in preadolescents' inferences and judgments. Child Development, 64, 1285-1294.</ref>