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It's not really an assumption, Prudie, for various reasons. Firstly, believe it or not, I know some women in my life, so I can just as easily ask them. Secondly, it's not like the effect of heel-wearing has never been studied, or surveyed before, and the verdict comes firmly against (see eg Ellipsis' link). Oh, and, thirdly, I've worn heels myself before, so I know what they feel like to walk in etc. (although not nearly as often as most women would).
Actually they did, mikey. Fairly sure there was some bewilderment and/ or concern.