Abstract
Little research has compared human males and females in their investment in unrelated same-sex individuals. Part of the difficulty lies in defining investment. The current study utilized durability of 6- to 11-year-old children's same-sex friendships as a measure of investment. Results demonstrated that males' friendships were more durable than those of females. Analyses comparing conflicts in current same-sex friendships of males and females did not yield any proximate explanations for sex differences in the durability of same-sex bonds. An evolutionary account is proposed for the greater durability of males' versus females' same-sex relationships.
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