According to this article in the London Times, it's not men. I think we have to take into account that many books are written for female readers -- 77% of women vs. only 44% of men buy and read fiction. According to author Joanna Kavenna, men are unwilling to read books by women, while women tend to read books by either sex.
It may be that my preference for female authors -- slight though it turns out to be -- is mostly a matter of compatible points of view, but I must also confess that I do not find many male authors capable of writing interesting and convincing female characters. I yearn for fascinating females in my fiction reading, so I read fewer male authors. There's nothing quite as disappointing for me as starting a promising book, only to find that the main female character is a large-breasted cardboard cutout, or worse, some poorly drawn remnant of the author's childhood, perhaps, that should have been psychoanalyzed away.
"Immersion in the life of the world, a willingness to be inhabited by and to speak for others, including those beyond the realm of the human, these are the practices not just of the bodhisattva but of the writer." --Jane Hirshfield