The 2D-4D digit ratio does not tell us about any information about one’s biological sex. However, the digit ratio can be predictive of an individual’s physical fitness, sexual orientation, aggression and academic performance to a certain degree.Because digit ratio is continuum, it varies among population just like the gender identities and sexualities people identify themselves with differ from individual to individual. In contrast, because sex is mostly binary, there are less variations among population comparing to that of digit ration. Therefore, there would be more correlation between digit ratio and gendered behavior or sexuality than between digit ration with biological sex.
The study by Romano et al shows that there is a positive correlation
The study by Romano et al shows that there is a positive correlation