Okay, let's start with this question: how do you define your gender?

Is it the combination of masculine and feminine attributes in you? Or is it something on a more abstract plane, like 'the essential characteristic of one's soul'... a non-feminine, non-masculine thing, but functioning as a gender in the mind of its owner.

One of the things I'm interested in is the construction of nonhuman gender identities. How do they slot in to the frame of reference typically occupied by male/female? To give some examples, I've heard of mechanical, draconic, and alien genders.

It may be a quirk of the human mind that even in extreme dissociative states like identifying as another species, we still feel the need to assign a sex to ourselves...