Studies on the lengths and size ratios of the second digit (2D or index finger) and the fourth digit (4D or ring finger) on men and women have been going on since the 18th century. Why is that? Research has shown that the length of the 4D tends to be longer for people who were exposed to more testosterone in the womb. For the most part, the 4D tends to be the longer of the two fingers in males, but in females the digits tend to either be equal size or the 2D is slightly longer. Why is that? Some scientists believe that the more testosterone (male sex hormone) that was present in the womb will make the 4D longer, whereas more exposure to estrogen (female sex hormone) will make the 2D longer.

In men, the longer the 4D is above the 2D, the more you should exhibit certain characteristics, including:

• Greater fertility
• Greater chance of being gay or bi-sexual
• Better at sports
• Better at playing music
• Aggressive personality

In women, the longer the 4D is above the 2D, the more you should exhibit certain characteristics, including:

• Aggressive or assertive personality
• Greater predilection towards being gay or bi-sexual
• Better athletic skills

Conversely, for women, the longer your 2D is above your 4D, you'll be more fertile and have a higher chance of getting breast cancer.

Basically what this tells us is that the more testosterone or androgen a baby is exposed to in the womb, the higher the incidence of the child displaying heightened male or female characteristics as an adult. But, these studies shouldn't be seen as way to predict the current hormonal levels in men or women. Many men who suffer from low testosterone levels do so regardless of the size of their fingers.