Sir_Quality_U_Feel wrote:

PSD-Kiwi wrote:OP forgot to mention one of the easiest ways to tell...Elbows. Not really sure how to describe it, but have a guy and a girl extend their arms straight and you will notice the difference. Its a dead give away once you know the difference.

EDIT: Had to do a quick google search to find a description of what I mentioned above, I couldn't find the words to describe what I meant

The angle in question is called the “carrying angle” and is seen when the arm is extended straight by the side (it’s easier to see if your palm is facing forward). The website, http://www.healthline.com/human-body-maps/elbow , provides the following information. “The resting angle of the elbow prevents the arms from hitting the sides of your body as you walk. This is known as the “carrying angle.” Women typically have smaller shoulders and wider hips than men, and this can cause variations between carrying angles in men and women.” The greater carrying angle in women develops during puberty. There have been quite a few studies done (you can google it), and the difference in carrying angle is now seen by many as a secondary sex characteristic (which could be used as a means to differentiate male and female skeletons).

When the arm is extended, with the palm facing forward or up, the bones of the upper arm (humerus) and forearm (radius and ulna) are not perfectly aligned. The deviation from a straight line occurs in the direction of the thumb, and is referred to as the "carrying angle" (visible in the right half of the picture, right).

The carrying angle permits the arm to be swung without contacting the hips. Women on average have smaller shoulders and wider hips than men, which may necessitate a more acute carrying angle (i.e., less angle than that in male when measured from outside). There is, however, extensive overlap in the carrying angle between individual men and women, and a sex-bias has not been consistently observed in scientific studies.[15] This could however be attributed to the very small sample sizes in those cited earlier studies. A more recent study based on a sample size of 333 individuals from both sexes concluded that carrying angle is a suitable secondary sexual characteristic.[16]

The angle is greater in the dominant limb than the non-dominant limb of both sexes,[17] suggesting that natural forces acting on the elbow modify the carrying angle. Developmental,[18] aging and possibly racial influences add further to the variability of this parameter.

Hmmmm. I remember saying this EXACT SAME THING months ago only to have bullshit called out on me by GM and of course OD..