Gender Differences

When looking at male and female skeletons side-by-side, one will notice several general differences.  Men tend to have "studier" looking bones, a squarer-shaped head, longer limbs, a smaller pelvis in comparison to the rib cage, and their femurs exit the pelvis at a straighter angle.  Women tend to have a "delicate" frame,  more of a rounded skull, shorter limbs, a large pelvis in comparison to the rib cage, and their femurs exit the pelvis at more of an angle.

The image on the left really shows the differences in body shape between the two genders.  Men are at their widest across the shoulders, women are at the hips.

from The Beginner's Guide to Human Anatomy by James Horton