It's been proved: Testosterone linked to driving ability....

'Bad' women drivers: hormone link: "

Studies looking at finger length ratio have suggested that, in men a long ring finger and symmetrical hands are an indication of fertility, and that women are more likely to be fertile if they have a longer index finger.

My ring finger is approximately 10 cm longer than my index finger and my hands are perfectly symmetrical... only ladies with short ring fingers need apply!