Why is the index finger of females the second longest finger they have?

Question

*Wait, 40% of females I guess, not all.

Answer 1

Finger length is determined by testosterone exposure while in the womb.

Answer 2

It's not, necessarily. I'm female and my ring fingers are longer than my index fingers. As the previous poster mentioned, finger length is determined by how much testosterone you were exposed to in the womb - if your ring fingers are longer than your index fingers, you had more testosterone than someone whose index fingers are longer than their ring fingers. This applies to both men and women, and has no bearing on how much testosterone is in your body NOW - it only references how much you experienced in the womb.