Human sex differences are a perennially hot topic that not only grips the public interest, but that has triggered a great deal of scientific focus from biological to social sciences. Two trained observers both maleone in each school, collected data. The effects of sex, structure and social interaction on preschoolers' play behaviors in naturalistic setting. The children's activities were recorded every 2 minutes during playtime that lasted on average 30 minutes. Our findings contribute to resolve the puzzling null or contradictory conclusions drawn from limited age-range samples or collapsed age-groups and raise important methodological issues such as the representativeness of samples in studies. Brenner M, Omark DR. Understanding the developmental dynamics of relationships between social competence, social cognition and sex should provide new insights on how the nature and the weight of underlying biological and social processes change over time  and even between sexes  during both typical and atypical development .
Among available peer play scales, we adapted the seminal Parten's  framework which covers the social spectrum of children's participation in peer play, with non-social activities:
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Following a cross-sectional design, children aged from 2 to 6 years old, divided into four age groups, were observed during outdoor free play at nursery school. Sex differences over the preschool years We evidenced important sex differences in children's social play, differences that stress a developmental gap between girls and boys Fig. Innocent Young Pussy in Tights. Conceived and designed the experiments: Fetal testosterone predicts sexually differentiated childhood behavior in girls and in boys. Pussy Licking Young Lesbians.