OK, let's be honest, Donkey Kong playing is the biggest sausage fest of all time. I mean, you could find more women at the Golden Banana night club, than you find playing Donkey Kong. There are more women involved in the Men's Rights Association, than you find playing Donkey Kong.
We have failed miserably to get members of the opposite sex to want to play this.
Who knows maybe it has to do with Mario being an unattractive character. He's a short, fat, plumber with an ugly big nose.