Sex, Gender, and Transgender

In this video, I go over the difference between sex and gender as well as what it means to be transgender. Some links to peer reviewed research articles. They go over causes and factors of being transgender: A.E.Brain:

http://aebrain.blogspot.com/p/transsexual-and-intersex-gender-identity.html

Cakeworld (scroll down to "observations" for the research papers):

http://www.cakeworld.info/transsexualism/what-causes