>My wife and I learned there’s some things girls like to do and some things boys like to do.

I don't have twins but I agree with this statement to a point. My daughter loves her Playmobil fire truck to the point that she slept with it a few times when she first got it. Her favorite stuffy was a frog for a while, until she started daycare and then we noticed interest in dolls growing.

I guess what I'm saying is that from my experience, social cues are much more powerful than people often like to think.