Sorry, this applies to women, not men ;D
And is for fun ONLY
With very little credible or scientific basis, if the answer is yes, your a lesbian! WHOO!!!
Ok, so the joke comes from the fact that men generally have longer ring fingers, and women generally have longer index finger- therefore, a woman with a longer ring finger like a man is a lesbian.
Have a longer ring finger? Show your pride and announce it to the world[and by world I mean the, likely few, people that will ever come in here]!!! Or go be lame [biased with ring fingers way longer than index right here] and have a longer index finger, that's fine. Whatever.
The small bit of credibility- It IS true that in this case, you likely received more testosterone in the womb... but no, it doesn't necessarily make you gay xD