Well I am not sure if there is a connection with big feet (or long noses either) and having a large penis--But I am sure that being able to curl your tongue is a genetic protection to detect toxic poisons. Ever chew on a leaf? That bitter discussing taste you get for all you tongue rollers, you can taste the toxins in the leaf because you can role your tongue--for those who can't roll their tongues can't taste them. Isn't nature wonderful?