I met my first gay person at work when I was 18...she liked me, but I'm not gay. We did hang out together, movies, but I felt she needed to find a real chance at the kind of relationship she was looking for I introduced her to a group I knew of learning how to live in this world as a gay person. She found someone and invited me to their wedding last year....
I worked in law enforcement for a while and met transgender people (a problem in jails, men or women, usually in a cell by themselves, for their protection mostly.
While not part of the group, I know what it is like to be different from the crowd. Coming from a background of abuse, sexual, etc., it took me a while to figure myself out.
Friendship does not need a basis in sexual activity to be a good friendship.