Carrying angle
Men have 173, women 168, that's just 5% difference (180% is straight).
And women have shorter arms, so the actual space that it would
give the hips by mid arm (where the arm hits the hip)
would be maybe 1 inch over men (that's not a lot).
Men have smaller angle, but longer arm, so the distance off from being straight
is can be bigger than a women even with the smaller angle.
As an example, for me, a female carrying angle gives me 1.5 inch horizontally more at
the tip of my fingers than with a male carryng angle. (3.5 VS ~ 2 inch).
So, they're not sure why it exists, not for the hips, though it seems to be due
to very early lack of T exposure, like the digit ratio difference.