Does it really make sense that *all* of the differences between boys and girls are based, exclusively, in nurture? I can't buy that, no matter how much I may want to for the sake of equality. Yes, it's true that people often treat boys and girls differently from one another, but when a parent is paying attention to such things, actively seeking to avoid them the child will lead in one direction or another. My son was indeed born with an interest in large, moving objects. I can remember him being utterly transfixed by a ceiling fan at the age of two weeks, watching cars out a window as soon as he could sit up on his own, pointing out trains and airplanes before six months.
This wasn't something that I did to him or something that I encouraged. I made a specific effort to present him with more "feminine" things, he played with baby dolls, his toys were actually more "girly" and gender neutral than not (we were living with my mom, sister, and two nieces when he was born). I often cradled him in arms-- until he screamed bloody murder and demanded to be held upright, and I realized something. Treating my son in the way that boys are most often treated by society wasn't going to cause my son to become more of a stereotypical male; it was because he was masculine that my son behaved in this way and demanded this kind of attention.
My first daughter was different. She wasn't nearly as interested in large moving objects as her brother. She wasn't as interested in interpersonal relations, either; she didn't want to be cuddled or held upright, she wanted to be left alone to move around on her own. A different personality, for sure, and less "feminine" or "masculine" than her brother. Her own wiring at birth lead me to treat her as I did; she screamed bloody murder if I tried to cuddle her and she wasn't sick, tired, or hungry. She was happiest exploring, and all Mike and I could do was offer comfort when she was willing to take it.
I don't believe that children of different sexes are wired to, say, appreciate one color over another necessarily; I believe that's a human thing, and that our brains are wired to prefer certain colors or make certain associations independantly of gender. On the other hand, those associations may well lead us to make certain connections. It's complicated. I guess I'm just saying, I can't buy into the notion that children are born blank slates and that gender is, entirely, a construct. It just doesn't make sense, and it's not what the evidence has suggested.