"Women like to believe in possibilities, and men like to believe in probabilities."
I confess that I don't really know what that might mean, but the question is worth exploring in any case.
Until fairly recently, the heavy hitters (the "celebrity" writers) in both genres were male, so one wonders what the break-in point might have been for fantasy. Of course, Mary Wolstonecraft pretty much kicked off the S/F genre, so credit must be given where due! And Ursula LeGuin didn't exactly start writing yesterday, either.
But some of the trend may have begun with spillover from the more traditionally "female" genre of Romance, thanks in part to Anne Rice and the vampire subgenre. Marion Zimmer Bradley's
Mists of Avalon likewise has an undeniably romantic vibe to it. JK Rowling's the richest person in the universe, of course, but she's a late arrival.
That's not meant to diminish the writings of these or other women in the Fantasy genre; it's merely a speculation on one possible source of their readership. And once a publisher identifies a reader-base, it's understandable that they'd seek authors who might appeal to that same reader-base. And if those authors are women...
Or maybe it's just that boys are taught to like guns and spaceships, while girls are trained to like unicorns... :sarcasm: