[Dimensio]

To lower the masculinity contrast between men and women (which is also why so many male leftist types on campus find long hair chic).

And here I thought that I kept my hair long simply because I like the way it looks. I never realised that I was really trying to blur gender distinctions.

[b_sharp]

Just for conversation sake:

As a teenager in the '70s and '80s I wore my hair long, roughly halfway down my back. (Think tall Jimmy Page)

As I aged, my hair was cut shorter and shorter, now at 50 I shave my head.

At no time have women (or I suspect, men) ever mistaken me for a woman. Most people identify the other sex using many more signals than just hair length. At a distance, I usually identify the fairer sex by their walk. Close up, movement is still important but proportions come into play.