Usually this is presented as "Finger length determines your gender", I don't think I've seen it used to identify your sexuality before. I can't verify if it is a sign of either.
I have, however, done some research, and can verify the following information as facts:
1. If your index finger is longer than your ring finger, it means that your index finger is longer than
your ring finger. Fact.
2. If your fingers are on your hands, it means that your fingers have not left your body. Fact.
3. If your fingers have bright colours on the tips of them, it means that you have painted
your nails. Fact.
4. If your fingers can form words on a keyboard, it means that you have learned how
to type. Fact
5. If you can touch your fingers to your thumbs, it means that you have opposable thumbs. Fact.
6. If you can make a noise with your finger and thumb, it means that you've learned how to
snap your fingers. Fact.
7. If your finger is in your ear, it means you have an itchy ear. Fact.
8. If your fingers are in both of your ears, it means that you can't take another word of
what I'm saying. Fact.
9. If your finger is in your nose...stop it right now!