Transsexuals have the body of one gender and the brain of another. They look at their bodies and know intuitively, "This is a mistake. I'm not supposed to look like this.
Why are some lesbians so good a fixing trucks, and don't want to blow dry their hair, but want to play rugby? Some part of their brain feels masculine.
Why are so many gay men skilled at interior decorating and know how to be best friends with women? Maybe they weren't bathed in testosterone at week seven after conception, so some part of their brain is female.
They're mixed gender people. You might be a mixed gender person. It partially depends on which hormones brewed your brain while you were in the womb.........