Index Finger vs. Ring Finger
Is your index finger (next to your thumb) longer than your ring finger (next to your pinky)? Or vice versa?
If your ring finger is longer, then you had more testosterone injected into your body in utero. If your index finger is longer, then you had more estrogen.
Personally, I didn't know that these two fingers differed in length. My index finger is definitely shorter than my ring finger, meaning I have more testosterone. Apparently this means I tend to be more competitive and more sexual, therefore less into committed relationships.
Interesting. I'm not sure I believe the research. But it's something to think about.