Studies regarding childhood play behaviour with respect to toy choices, the sex of preferred play partners, and social play have shown that behavioural sex differences appear early in life (Hines, 2004, p. 17). By the first year, children prefer different toys, and these sex differences persist through childhood (Hines, 2004, p. 109). In general, boys tend to choose toys like cars, trucks, and guns, whereas girls prefer toys like dolls and tea sets (Berenbaum and Hines, 1992). For both boys and girls, about 80-90% of playmates are children of their own sex (Maccoby, 1988). Boys also spend more time than girls do in rough-and-tumble play, including play fighting and wrestling (Maccoby, 1988). However, the extent to which the behavioural sex differences differs among children, and we shall now
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