Humans strive for perfection in all forms of aptitude and beauty... physical, emotional, intellectual... etc. The question is answered everyday by your own actions, what numbers do you strive for (which numbers are you comfortable with). By nature of having children you further proliferate that desire to improve. Life is the journey of striving for that perfection... you make the choices as to what that perfection is. The arguements I have seen so far are that 10/10 is accepted to be the ultimate settings... whos to say some other combination is not the more "perfect"?