You can't use scientific reports as a crutch, particularly in a debate where most of the points come from personal experience and beliefs. In this debate, few people care about the biological science behind it all. The question is where the line is crossed when something becomes sexist.
What I say is that there are differences between both sexes, and that is just the way it is, we can call it sexism or not, how we name reality is secondary when compared with how reality truly is.
However, I start having a problem when that is all I see of women, even though I am a paying consumer who loves video games - and when I am not the only girl who is paying money. It makes me feel left out. [...]
I don't want to take away power fantasies, or any fantasies at all. I just want women to be heroes.
I guess the female gamers are still a minority, and thus developers will focus on males most of the time, they do their best to appeal their audiences, as audiences change so will they, specially if this is an issue for you and this kind of things have an inpact in your (as a group) purchase decisions. Developers will do whatever gives them money, the day the wave of a schlong under a skirt boosts the sales of a game we will be seeing lots of those, if that's ever the case. It's not now and I doubt it will ever be, because there are reasons for the way things are, and in any way they evolve, it will be for good reasons. Nothing happens for nothing.
In any case, things are changing to some extent, and it's possible to find cool female characters in may games, like wet, jade empire, beyond good and evil, mirror's edge, the new tomb raider, etc. In general they are related with the concept: "female protagonist", although again most of these games are again targetted towards men, because women don't play games so much anyway, which may be the cause or the consequence of this trend. As I say, I think there are biological differences between sexes, one of them the competitiveness, and hunger for challenges, which is the main appeal of games, achieving challenges, and this is as well related with testosterone.
Were this an issue, I'd prefer fighting against the aging process than this, because growing old and dying worries me more. But of course, each one is free to choose their causes.