Hmm, rather than waste my response to the two deadheaded comments below the above and now my zombie peers; I wrote:

  > an explanation for the recently-invented concept of "gender".

  Perhaps recent to certain Europeans in central north america .. but hardly a recently invented concept.

  When I was a kid in the 1960s in the Austral Asian equatorial region the missionaries were going hard trying to stamp out Sistergirls, the bugis gender roles, and every other abomination under God that caught their eye.

  As I heard tell, indigenous north and south americans had expanded concepts of gender that got the same treatment.

  If there's a fallacy it likely lies with repressed WASP types brainwashed into a rigid moral prison of a worldview.