Queer is one, of course (not in the sense of "bugger" or "curious" but as a keyword of non-fixed gender identities, "the queer movement" - but I don't think we have much expertise of that here). I don't feel up to speed with it and NatalieD has just started sharing her knowledge of the difficult life of transsexuals (meaning physical sex-changer) - taka a look at her own thread here at Knowledge base