Sex hormones occur naturally in our bodies and are produced by the gonads (ovaries or testes), by adrenal glands or are made from fat cells.

There are some key differences in the appearance of the forehead, eyes and jaw between men and women that are used to determine the sex of a skull.

Nobody can hide his/her true, original sex. Mission impossible !

TRANSformers may be trained in mimicking the opposite gender gait, but they cannot change their original pelvis and femurs. 

Shoulders, clavicles, arms and hands are obviously different in male and female skeletons. 

The COG is a hypothetical point in the body around which the force of gravity appears to act. The point where the mass of the body is concentrated. Men and women have a different center of gravity.