Sankaku Channel/

ALAKTORN said:
I was thinking– what about hetero, yaoi, and yuri, which apply to intersex? Is that even relevant?

Tucky said:
Futa sex [as relates to yaoi/yuri] is problematic but the label could be based on which set of genitalia are being used on/by which gender. A futa taking a male up the ass would be yaoi, while being done vaginally by a male would be hetero [...]

If we consider "hermaphrodite" a third gender, then the context of yaoi / yuri does not at all apply to hermaphrodite content, as yaoi is specifically boy with boy and yuri girl with girl.
However...

Tucky said:
For futa on futa I can't see any of the lables fitting so maybe just let futa_on_futa be enough for those.

^ This point is solid. =)

Tucky said:
Newhalf interacting sexually with other newhalf or ordinary males/traps should be labeled yaoi, since newhalf's sexual organs are still male.

^ While this is true scientifically, I believe yaoi expresses, at least popularly, a genre of work that does not include newhalf content.  PM me if you'd like to talk about this more'