Ok try this.
Get some pals both male and female to stand up straight with their hands by their sides with their palms facing to the rear, rotate arms until palms are facing forwards and look at the straightness of the arms.

Most males arms will remain straight, most female arms will angle outwards from the elbow like the competitor you posted. A specialist othopedic bone pal of mine recons it's natures way of clearing female hips while carrying something.

George