I would be very hesitant about drawing the conclusion that gheyness was somehow genetic from this study - I don't know that the study actually says that - it's just a comment on the study by a cognitive biologist, who's entire job is convincing people that evolution is determined on a molecular level (things are possibly more complicated than that).

There are also recent links between the size of brain structures and autism, aggression in children, cocaine addiction .. and so on .. but no one can say whether the brain changed because of X, or whether the brain was always like that and it just increased the potential for X.

So this is useful, but they still have no idea about the brain, tip of the iceberg stuff =).

*suddenly considers doing brain scans of furs* Nah...