Helen Boyd wrote the books My Husband Betty: Love, Sex, and Life with a Crossdresser and She's Not the Man I Married: My Life with a Transgender Husband. I've read the latter and it is full of astute comments on gender and sexuality, especially her transition from a heterosexual woman married to a man to a woman who is legally married to a trans woman who may or may not complete a surgical and legal transition which would render their legal relationship invalid.
Anyway, there was a post in Boyd's blog
(en)Gender about the differences between being transgender and being gender-variant.
This is a conversation I would like to have more often with people. I find so often that conversations about being trans get shut down because people are worried about (or told that they are) transphobic. While I think it is important to avoid transphobia, I really think that messy conversations like this one are crucial to our learning how to navigate the world as responsible beings.