... known as the 2D.4D ratio — the length of the second digit (index finger) divided by the length of the fourth digit (ring finger) — may serve as a biological marker for predicting sexual activity.
The science behind finger length and endurance ... This is linked to exposure to testosterone in the womb, which influences fetal development, including finger length and athletic ability ... While finger ...
The ratio between the lengths of the index (2D) and ring (4D) fingers, known as the 2D.4D ratio, has been associated with various health and behavioral aspects ... ring finger.