lol, I agree with the sentiment. Like I said, it varies tremendously from person to person. But, technically speaking, if all women loved huge fat cocks, the human race would not die out. Small dicks would die out though... natural selection and all.
Still, that is proof that penis size is not a very high priority in natural selection. If it were, the average penis size would increase significantly over time. Someone will have to dig up some pharaohs and measure the mummified remains of their penis.
At least we'll know for sure that measurement is "bone-pressed"...
On a side note, I read a book by an evolutionary biologist (Sperm Wars, Robin Baker) who believes that there's a natural selection reason for black men having larger penises. His theory is that (for whatever reason) women in ancient Africa were having sex with multiple partners each day. (Perhaps tribal custom?) Anyway, his theory is that a big penis forcibly removes from the vagina any leftover semen from the previous lover. They verified these tests by measuring the amount of "semen displacement" caused by a small penis vs a big penis. (I want to work in that lab, lol!)
In fact, the ridge behind the head of the penis is believed by some to be for the very purpose of scooping out "enemy" semen. Anyway, my personal theory is that there is a social evolution reason for it. For example, in a tribe with ritual body manipulation (piercing, lip expansion, neck stretching, etc.) and in a climate where people walk around with their penis uncovered, it's not inconceivable that it became a status thing to have a big penis, and so those guys were more likely to conceive. It also might explain where some of these very Penis Enlargement exercises came from. Who would be more motivated to do them than someone in a tribe where a big penis was prized for mating?
Who knows.
Fascinating read though. Word of warning: Don't take his book too seriously or it'll make you paranoid and convince you that your girl is going to cheat on you.