There has been a lot of research published on the relationship of the ratio of your index finger to your ring finger upon masculinity. This is called the 2D/4D ratio (your index finger is the second digit and the ring finger the fourth digit on your hand). Statistical studies have shown a sound link (specifically a negative link) between the magnitude of this ratio and male traits such as aggression, masculine facial features, higher ratio of lean to fat mass, and risk taking behavior. In women, lower 2D/4D has been associated with lesbianism and propensity for sports.
So the larger your ring finger is compared to your index finger is related to your manliness. Why is that? It has to do with your exposure to androgens (i.e. testosterone) in the womb. Androgen exposure during fetal development can influence the structure of your brain which then influences behavior patterns for the rest of your life. Additionally, this exposure can influence physical development of the body and this includes the relative length of the fingers on your hand. As a consequence, we are able to look at our hands and get a decent idea of our fetal hormonal environment and so ponder what it may have meant to our personalities and personal development.
What makes this subject relevant to us (males specifically) right now is the fact that a study has been released showing that this ratio is not just a reflection of how much testosterone was around when you were floating around in your mom’s womb, but it actually may be related to how much testosterone your body likes to make as an older adult. A large group of men (average age 67) were analyzed for testosterone levels and it was found that low testosterone (hypogonadism) was substantially more prevalent for those with a large 2D/4D ratio. The men with the smaller ratio generally had decent testosterone levels.
So is there any practical significance to this or did I just post it because of its curiousity factor? I suppose there may be some usefulness to all this if you are an older gentleman. You may want to look at your hand and if your index finger is the same length as your ring finger it may be time to consider getting a blood hormone test – especially if you are experiencing symptoms of hypogonadism such as depression, low libido, weakness, and erectile dysfunction.