Uhh.... Striker, you understand that what you said about human populations is totally false.

First off, I can barely understand what the hell you meant. Secondly, where did you get "per couple have average of 12 kids"? Thirdly, there are many cases where many people had no kids, periods where populations actually declined, like the plague that wiped out what, 1/3 of Europe or something like that.
What you said is just absolutely stupid.