An elongated second toe used to climb trees, and hang by ones feet from balconies.
In women, useful in getting a better grip on their mates back. In males, useful for quickly climbing down from second floor windows when husbands roll in the front door.
More likely in chronic masturbators. An unnecessary accessory in the short and squat.
Also called "ape toe" or "frog toe."
Q. Why does she wear flip-flops all the time?
A. Her evolution toes are so long that she can't find shoes to fit.