Further to the point about the shape being designed to not lift women's skirts, I am looking into buying a road bike, and have been told that many of the road bikes are manufactured to different proportions, with girls tending to have longer legs, and shorter arms and torsos than their male counterparts. The drop handlebars tend to be narrower, and they tend to have saddles that are designed for women.
(And if you're planning on cycling in a long skirt, and do not want to show your bloomers, don't buy a women's road bike either, as the support bar isn't lowered on these)
I hope that answers your question.

 

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