From a guest post by Lisa Scott posted on The Mormon Therapist:
Talking about sex or gender as a binary concept is not in line with psychological OR biological science, and is so harmful to those that do not fit in the traditional binary model. Please, before forming opinions about this topic, read up on the current research. Even in my biology/psychology courses at BYU, we talk about these things in very complex ways.
Source: Biological Sex and Gender are not Binary | Natasha Helfer Parker