Sue,
It is my belief that reading the fiction that a group, such as transgendered people, read and write, is a window into their true selves and motivations. I have learned a great deal about various communities and sub-groups, with alternate lifestyles, by studying the themes which are recurrent in the related fiction they prefer to read. I think it would make a good liberal arts course for psychologists to take if one was directed at examples of this literature. It takes little effort to link different types of stories to different TG subgroups, for example. I'm sure it would help them understand our wide spectrum of TG people better. A story that would appeal to a TS, for example, would be quite different from one that appealed to a heterosexual, male cross-dresser. Not that we don't all have fantasies we would not carry out in real life. A clients FEELINGS about the story theme are the key. It might teach "eunuchs" what they need to know.
Asking a gender identity client to read a group of stories and discuss them in therapy sessions might also have great value in determining some of the TG person's orientation/preferences.