Originally Posted by
nicolai
If only genetics, human growth, and anatomy were that simple. Unfortunately they are not. Google up "Intersex", "androgen insensitivity", "Klinefelter syndrome" (XXY, XXXY, XXXXY), "XYY syndrome", "46,XX/46,XY" for some of the medical aspects, let alone the social aspects.
His suggestion is consistent with all of that, and it gets around it all by simply discriminating the physical factor that correlates with weight without getting entangled with definitions of sex, gender, social/personal identity, hidden genetic syndromes, etc.