Why did different cultures and civilizations across the world, before they were in contact with each other, all discriminate between men and women?

by paradox_djell
instantiatedObject

this may be better suited to /r/askscience, where someone well versed in evolution and evolutionary psychology could weigh in.

vertexoflife

Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your question and submit it again. Alternatively, questions of this type can be directed to more appropriate subreddits, such as /r/history or /r/askhistory.