I don't think you'll find that many women who will sign a prenup. It's basically a signed statement that you both think shit won't work out and that she's a money-grubbing whore. Neither of which is what a woman wants to hear, true or not.
That's only in some states and only if she doesn't work. If you're a stay-at-home dad (my dream job) or you make less than her, you stand to take some of her $$ if you divorce.