Once again, you are making an insane amount of sense. I have the following theory: It isn't women that control the birth rate, it is men. While not all women want a lot of children, if a man wants 10 kids he can find a woman that will provide 10 kids. Women sublimate them selves to the needs of the relationship. What if you are correct an: It isn't women that control their weight by men. What if women sublimate them selves to the relationship and the man has to provision the behavioural control guidelines to keep them slim? Hmmmm.