would you care to provide links to said polls? I've not heard anything of the like. the only things that I've heard along those lines are that females are the quickest growing demographic amongst "gamers" but that statistic is also including games like candy crush and clash of clans, and is full of misconstrued information.
I've read similar things, that "female gamers" are a large demographic, in terms of both numbers of people, and the amount they spend on gaming.
Though, I've also read that "the Sims" franchise has had a very, very, very large effect on those statistics. Because that DLC for those games runs into the thousands of £$.