WHY AREN'T WOMEN BORN WITH BUILT-IN LOCKABLE ZIPPERS?

 

This question really isn't as odd as it sounds. Human evolution is an ongoing story of physical and mental adjustments that have come about in order that we might survive as a species. Our minds and bodies have adapted to their environments. Or; when bodily adjustment is impractical, impossible or just too slow; we have adapted the environment to suit us.

For example: the standard explanation for our development of an up-right posture and, two-legged locomotion is that it freed the hunters hands to throw missiles at their prey. Making for more efficiency in the battle against starvation. Our body changes weighted the odds of survival in our favor, but it also slowed us down. To compensate for the limitations of two skinny legs we rode faster animals with smaller brains and invented the internal combustion engine.