ABSTRACT
The objective was to identify sex differences that have been consistently documented by scientific research in all countries studied, i.e., discover universal sex differences (USDs). Females are more likely to suffer from breast cancer, exhibit greater joint laxity, have longer QT intervals, higher 2D:4D finger length ratios, and lose bone density with age more rapidly than males. The number of attitudinal and preference variables qualifying as USDs was surprisingly numerous. Many apparent universal sex differences having to do with criminality, resource acquisition, and consuming behavior were identified. Many work-related behavior patterns have been studied in connection with sex differences. Most of the stereotypes for which USDs were located basically supported their corresponding stereotypes. Specifically, in essentially all countries sampled, males appear to be more physically aggressive, independent, adventurous, dominant, and likely to receive higher incomes.
