A perfect definition of the Third Sex given by a homosexual

"The third sex is described as a natural mixing or combination of the male and female natures to the point in which they can no longer be categorized as male or female in the traditional sense of the word. The example of mixing black and white paint can be used, wherein the resulting color, gray, in all its many shades, can no longer be considered either black or white although it is simply a combination of both"

-- By Amara Das Wilhelm, 'Tritiya-Prakriti: People of the Third Sex'