Evercrook - Yes, I noticed the same thing as well. But, I always say to each his own and its what makes our world a brighter and more colorful place to live in. In my mind I think it is because if one is living as 'male' and then physically transitions to female (their true self), I do not see why the sexual preference would change since it is only the exterior features which are changing and not the mind. The mind was always female. Makes me conclude that regardless of our outer shells, some of us are bisexual, some lesbian, some heterosexual, on and on....
But what do I know.