Body swaps and soul / personality migrations
- Ursula K. Le Guin, The Left Hand of Darkness (classic gender-exploration novel; the world is peopled with hermaphrodites who phase in and out of male or female genders ("kemmer"); in a later short story, Le Guin explored the differences in sexual experiences across the genders on this planet)
- Kim Stanley Robinson, The Years of Rice and Salt (2002) (reincarnation across multiple genders; some demonstration of sexism in society, but the characters' spiritual essence appears to be genderless)
- Geoff Ryman, The Warrior Who Carried Life (magical transformation of female to male body)
- Thorne Smith, Turnabout (1931) (an early instance of body swapping in literature; probably the thematic inspiration for mostly non-sexual "Freaky Friday" type body swapping films)
- Virginia Woolf, Orlando (1928) (and see Sally Potter's film adaptation, (1993))
- Charlotte Perkins Gilmore, "Turning"; short story about a wife magically transferred into her husband's body, experiencing the freedom of male dress and petty sexisms.
- See "Freaky Friday" at TV Tropes wiki
Technology makes changing sex easy, and fun, too
- Iain M. Banks's "Culture" universe, notably The Player of Games
- Tanith Lee, Drinking Sapphire Wine and Don't Bite the Sun
- John Varley's "Eight Worlds" universe, particularly "Options," Steel Beach, and The Golden Globe