The idea that there's a gender correlation, whether for cultural or biological reasons certainly is something I've seen a fair bit when this comes up as a subject. See for example here. This one where cultural distinctions are going to be very difficult since some cultures (e.g. China) are so heavily on one side. It would I think be very interesting to see if the obvious gender trend in the West still is true in those extreme examples- it would be pretty strong evidence of a biological basis.