What Science Says:
Several studies have shown that heterosexual men are better at both navigating by north-south directions and at orienting themselves in three dimensional space than women. Why did men win the spatial perception jackpot? No, the answer isn't sex this time, it's food. Well, actually, it's both.
Some things aren't better when combined.
In the days before grocery stores and mini malls, mankind had to actually go hunt and gather for his daily mammoth chops. Scientists think that testosterone helped early men find their way home again after a long day of hunting, ensuring that they were the ones impregnating their mates and continuing their line while the spatially challenged became saber tooth tiger snacks.
Not only that, but one researcher actually scanned the brains of over a million kids and found that by age four, the boys were already surpassing the girls in spatial ability by a ratio of 4:1. She also found that while girls did just fine at seeing two dimensions in the brain, boys had the ability to see a third dimension, allowing them to understand the concept of depth at an earlier age.