There is evidence that this reflects fetal exposure to the hormone testosterone. The [ sexuality indicators] are most certainly there, but they're not strong enough to allow us to make predictions. Sexuality Several studies have suggested a link between sexual orientation and digit ratio, with men who have longer index fingers more likely to say they are attracted to other men. Share this infographic on your site! An image demonstrating how the "digit ratio" is calculated.
It should be noted, however, that the standard deviations associated with each given 2D:
Increased aggressive behavior in sports. The sex difference in 2D: Personality and Individual Differences. American Journal of Human Biology.