There is currently a tag lgbt that seems to be put on questions asking about the sexual preference of characters. However, since LGBT does not cover the "full spectrum" of sexuality, should we just create a sexuality tag to cover all questions that relate to the subject?
I like this idea. I've retagged all lgbt questions as sexuality for now. As you note, the lgbt tag is somewhat imprecise. Since the acronym lgbt refers to a group of people, it's not clear if the tag refers to literature written by lgbt authors, lgbt characters, etc.
In the future, we might want to think about creating a "queer-theory" tag. (Assuming we get good questions about queer theory.) We might also want to potentially think about creating a "queer-subtext" tag.