I never realized that female nipples point at a 45 degree angle from each other (i.e., they do not point straight ahead) until I took a human anatomy drawing class. It was interesting that something right in front of me was not obvious until pointed out.
A woman with very small breasts won't have the tissue volume to have nipples pointing at certain angles, but in average to large sized breasts, they point in many different angles. It's more dependent on tissue density + how self supportive the breasts are.