Here's a quote from Rubenstein female protege, Janina Fialkowska, which I found interesting:
"I think there's another reason, too, why we womendon't take too well to this [piano] profession [Fialkowska first mentioned motherhood] - and I'll probablly have a lot of women jumping down my throat for this one - I just don't think we're that strong. I'm sure I get much more fatigued that my male colleagues. I try not to admit it, or give in to it, but there are times when I can hardly move, I'm so tired. One of my best friends is Emanuel Ax, and I notice how nervous and tired he occasionally gets from the amount of playing he does; he even sometimes looks unhealthy, and I try to avoid that degree of tiredness. Although with the fatigue he can manage wonderfully with a bigger schedule that nime. Perhaps I too could cope, but perhaps not. Yet I can't help feeling that that's one of the reasons more women don't enter the field -- we simply get tired more easily.
[...] I played the Liszt Transcendental Etudes, which is not an easy thing to do. I did it just to show that I could. The same holds true for the Brahms and the 3rd Rachmaninoff. I know it's pushy, but I love the pieces. But eight years ago I was attempting the same works; I was just everywhere in the chord passages and octave passages. I just didn't have that feeling of absolute power that some of my very short, and somewhat weak, male colleagues had. They could play those pieces and it just sounded huge. So I told myself that I'd just have to learn to do it, and I worked, and worked, and worked.