WSD is almost all marketing, depending on the country you are in and ethnicity a typical woman may well be the complete opposite to what the different geometry implies. In South East England there was a large study of height/leg length and it was clear that on average a 18-25yr old woman there has shorter legs as a proportion of their height than the men in the group. Yet the WSD bikes are all set up for longer legged women. The reality is that this actually equates simply to a less aggressive set up with a much higher head tube which may or may not be what a woman wants. If they do they can get it from a mens "sportive" bike anyway.
Women do have different sit bones and tend to have narrower shoulders, so a different saddle and narrower bars would likely be sensible if you buy a mens bike, otherwise a bike that fits is all you need.