Alternating Gender Identity Variability

The WNYC radio show "Radiolab" just did a fascinating show on gender identity - a very unusual kind of gender identity.

http://www.radiolab.org/story/invisibilia/

You can either listen on the web site or download an mp3 file. There does not appear to be a transcript available.

Do you think someone can "flip" genders on a frequent or infrequent basis?

Have you ever heard of this before of known anyone with it?

Do you agree that the subject is TG? Some gender experts think otherwise.

Do you think that the subject's choice to take estrogen, which seems to have stabilized her identity, was the right one?

And lastly, this being a venue full of creative writers, have you ever thought of this as a fiction device? Now that you've heard of it, do you see possibilities?

Kris