Jul 5, - July 5, -- The ratio between the length of the index finger and the ring finger of men's hands is associated with penis length, a study shows. Researchers found that men with a lower ratio, or a shorter length of the index finger compared to the ring finger, tended to have a longer penile length. Jul 4, - Finger length may have link to penis length: study. 3 Min Read. HONG KONG (Reuters Life!) - Hands may say more about their owners than.