The effects of degree of sexual homogeneity, in groups of preschool children, on performance of a task were studied. Twenty four-year-old male children from the Utah State Child Development Laboratories served as subjects. Each subject performed the task of placing pegs in a pegboard during a sixty-second time interval; once in a group of opposite-sex peers; once in a group of same-sex peers; and once on a one-to-one basis with the author. The findings seemed to indicate that preschool children's rate of task performance is not influenced by the presence or absence of peers of the same-and opposite - sex. Differences between scores of subjects under each experimental condition were not significant.