Can you tell if a corpse was male or female by only examining its skull?
According to textbook of forensic medicine and toxicology by Ks Narayan reddy:

Qualitative differences are:


Male mandible has everted ramus, but female have inverted ramus.
Males have chin U shaped, but it's rounded in females


Quantitative differences:


Suparaorbital ridges are prominent in males but often absent in females.
Mastoid process is wider, longer and blunt in males but is narrow and pointed in females.


And there are many more differences, see the pics below: