What's Your Favourite SF/Fantasy TG-themed novel?

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WHAT'S YOUR FAVOURITE SF/FANTASY TG-THEMED NOVEL?

By Touch the Light

Here are a few of mine. I hope you can introduce me to others.

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'The Identity Matrix' by Jack L Chalker
A rare stand-alone novel from the undisputed king of transformation stories. It begins when a lonely 35 year old male on a hiking trip is suddenly turned into a 13 year old girl. After that it gets seriously weird.

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'I Will Fear No Evil' by Robert Heinlein
I'm not Heinlein's biggest fan, but he makes a really good job of this brain-transplant yarn.

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As far as I'm concerned, Tanith Lee can do no wrong. This cover is from an edition that contains her novels 'Don't Bite The Sun' and 'Drinking Sapphire Wine', set in a decadent far future where the rich can change sex any time they feel like it.

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Ilario is a true hermaphrodite living in 17th century Venice who accidentally becomes pregnant. As he/she finds it much more convenient to pose as a male, this causes a few problems. Like many of Mary Gentle's central characters, Ilario is difficult to warm to, but the setting and plot development are superb.

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'Orlando' by Virginia Woolf
Was this one of the first tg-themed novels ever written?
Orlando is a picaresque character who seduces his way around renaissance Europe until for no discernible reason he wakes up to find 'he' is female. Seemingly unperturbed by this, she manages to hang around until 1928 to write her autobiography.
Many have interpreted this tale as a metaphor for women in literature, but it's still a gripping read.

I await your additions to this list eagerly.

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