“…For example, it has long been observed that the sexes differ in the extent to which they display sex-typical behaviors; when there is significant between-sex variation, it is almost always the case that girls are more likely to engage in masculine behaviors than boys are likely to engage in feminine behaviors (e.g., Cole, Zucker, & Bradley, 1982;Sandberg, Meyer-Bahlburg, Ehrhardt, & Yager, 1993). Thus, the base rates for cross-gender behavior, at least within the range of normative variation, may well differ between the sexes.…”