See the Useful Notes on Transgender people for a more Real Life-oriented and complete description.
If your kink is huge tits then the big breast archive is the place to find your old favourites like L.
Ambiguous Gender Identity is a trope for characters who may or may not be transgender.
Has nothing to do with Transhumans; the shared root "trans-" Patty: Hello, my name's Patty.
Contrast Gender Bender, which is a trope about characters changing to another sex through magic or Applied Phlebotinum.
Gender Bender often also changes DNA, thus allowing plots such as the now-biologically-male or now-biologically-female person being able to conceive a child, further complicating things. I mean, I don't want to offend you, but, you were born a man, weren't you?