When was the last time - if ever - you saw a woman do something for a man?

With women being equals now and all that fine shite that supposedly moves us forward as a species, you'd think you would occasionally see a modern woman hold a door for a man or help him carry something to the car, etc. But you never, ever see it this kind of stuff. Even men who weren't taught chivalry by their father will sometimes pull it off, but a woman? Nada. What can explain this discrepancy?