You're implying that people learn this at university. My experience was the opposite; I took an animal behaviour course at university that presented much of this information. Sexual dimorphism is a fairly major topic in animal behaviour.

For instance, I learned that in every society where it was tested, men are more violent than women. But interestingly, the society itself was important as well; for instance, American society is overall more violent than Icelandic culture, and accordingly American women commit more violent crimes than Icelandic men. So there are differences in between the sexes, but the culture is a very important input if we look at how extreme the trait is.