Apparently the differences between men and women's feet is significant enough for a well designed boot to need to take that into consideration. Various websites explain it but this gives the basic details (add https:// to the beginning - the forum won't let me post links):
hubpages.com/sports/differencebetweenmenswomenshikingboots
Totally agree with you that if it is comfortable for you it doesn't matter if it was made for a martian, comfort is all! But, as I am needing to make an online purchasing decision then I was trying to cover all possible pitfalls.