Just to put this in the proper context, Donna had said that she doesn't feel she is a woman internally. I'm assuming she doesn't want to be one either. So I asked her (him?) why she presents as one in her avatar.
If you feel that you are a cute person internally (of if you want to be cute and pretty), then you should reflect this in your avatar.
We all pigeonhole the people we see based on their initial appearance. The cues are numerous: age, general hygiene & grooming, style of clothes (whether someone presents as a biker, lawyer, or fashion designer), creativity (think art student compared to business major), ethnic cues, even height, weight, and physical attractiveness, degree of stylishness. All of these things form part of first impressions and it makes sense that people in general will be more open to others who present a positive and well groomed appearance than someone who doesn't care how they look. It is human nature, I believe, to respond to some sort of fuzzy social hierarchy.
I'm guessing this is why CDers generally want to present the best possible image of themselves in girl mode. I don't see a lot of CDers walking around dressed in slovenly girl's jeans, with torn and faded girl shirts and threadbare shoes, or a frumpy, shapeless dress. :p So I always wonder why so many CDers seem to sabotage themselves in guy mode when they don't pay equal attention to their male appearance. It almost seems a rebellion against being a guy to me. Or, maybe the CDers who do this don't care much about being guys?