When was the social norm where men have short hair and women have long hair established? Why is it so common? | AskHistorians Archive Observer

When was the social norm where men have short hair and women have long hair established? Why is it so common?

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BZH_JJM

This question comes up a lot. Here's the entry on the FAQ: http://www.reddit.com/r/AskHistorians/wiki/dailylife#wiki_on_men_with_short_hair.2C_women_with_long_hair.2C_and_vice_versa