There was in interesting episode of "Through the Wormhole" with Morgan Freeman about the brain and are there more than two sexes. It is very interesting. 48+ minutes long, but it actually attempts to explain that being Trans* is not abnormal in nature.
Here is a link to the full episode: https://www.youtube.com/watch?v=tjeX71hTK1E
https://www.youtube.com/watch?v=tjeX71hTK1E
YouTube/Published on Sep 14, 2016