Insisex

undefined:

Insisex is a descriptor for headmates who have sex characteristics outside of the human bimodal categories, regardless of whether or not these characteristics can exist in shared reality.

Insisex headmates can be non-human (e.g., earthworms), or they can be human and have intersex characteristics.

Related terms
Notersex can be used if headmate is considered intersex in human concepts, but not in their society.

Innosex can also be used if the headmate is intersex in a perisex body.