Across the population, baby boys are slightly more common than baby girls. So my husband and I often wonder how we beat the odds and produced two baby girls in a row. 

According to a provocative new book, it could be because we're so darn good looking. But I have my doubts.

The book is "Why Beautiful People Have More Daughters: From Dating, Shopping, and Praying to Going to War and Becoming a Billionaire -- Two Evolutionary Psychologists Explain Why We Do What We Do," by Satoshi Kanazawa.

The argument behind the title, as summed up in the Seattle Post-Intelligencer, makes little sense to me: "Kanazawa's research finds that people who are rated 'very attractive' have a 56 percent chance of having a girl as a first child compared with 48 percent for the rest of the population. Kanazawa said that's because beauty contributes more to a woman's reproductive success than a man's. So, beauty ups the odds of having a girl by 36 percent."

Huh? So I can see how it would be more advantageous for a woman to be more attractive, but how does that explain more X chromosomes hitting the mark, or more female embryos or fetuses surviving than males?

I thought perhaps the newspaper's reporter wasn't giving the theory an adequate explanation, so I searched for a better one.

I found, instead, an excerpt from the book itself on a blog called Echidne of the Snakes. Instead of clearer, the issue actually gets more complicated when you read Kanazawa's own words. He says that throughout time, more wealthy and successful people have had more sons, but more attractive people have more daughters. The idea being that "wealthy and successful genes" are more reporoductively advantageous to males, and "purty genes" are the only thing we females know what to do with.

The Post-Intelligencer quotes statistician and Coumbia University Professor Andrew Gelman saying that the supposed big girl surplus for beautiful people is statistical nonsense.

"Echidne" points out that the whole theory about who has more of what, which Kanazawa calls "One of the most celebrated principles in evolutionary biology," is something that book author Kanazawa has largely put forth all by himself.

And nobody, it turns out, has offered any theory on how this supposed boy/girl favoritism happens in the old fallopian tubes or womb.

OK, maybe it's not my supermodel looks that allowed me to win the genetic jackpot with two lovely daughters. In reality, of course, two consecutive births of the same sex do not a statistical anomaly anyway. But while I'm at it, I could also hypothesize that we had two daughters because we lived really close to the freeway when we conceived them, or because I didn't gain much weight between pregnancies.

And for all you parents of boys out there, I imagine I would still feel like I won the jackpot if I'd spawned two boys. When it comes to babylove, the grass is always greener exactly where you are.