Shadow Man by Melissa Scott
Approx. 108,320 words.
Published on December 10, 2010 by
In the far future, human culture has developed five distinctive genders due to the effects of a drug easing sickness from faster-than-light travel. But on the planet Hara, where society is increasingly instability, caught between hard-liner traditions and the realities of life, only male and female genders are legal, and the "odd-bodied" population are forced to pass as one or the other.