When I first started reading about poly in 2010, I had come across an article somewhere that talked about how woman-centric poly is. It stated that women are leading the way in embracing poly in Western culture. I don't remember where I came across that article, but I just found a newish one, from March 2012, which does address this a bit.
And it's a pretty good read:
Making Love and Trouble: The surprisingly woman-friendly roots of modern polyamory.