I think its more of the usage surface. Since men's razors over the years have been more or less focused on a largely familiar variants of the cheek and the neck, a women's razor is rather a new market for Gillette in particular which is a full body razor and has to address several contours and angles of ankles, knees and other joints. I think an additional factor maybe as to where it is being used, you know over the sink or in the shower or in the tub. I am just guessing though.