"Oh, I see the problem. Where I'm from there are not that many genders. ...Okay, there might be that many genders but there aren't that many sexes. Or if there are they're not really common. Anyway my species definitely only has two. Based entirely on what I can get from those words I think I'm sort of like - combination desan and desret? I mean, I guess I could pick one if that makes it easier for you but it's not a real thing that exists for me to be one of, in my world."
"Sure," says Aurin. "What is... uh... the point of having so many? Like... uh... examples... sprites, sprites sort of have three sexes, I haven't personally met any sprites but it's a thing, but they have them like that because of how sprites work elsewise, what's the way you all work that needs six genders?"
"It's--it's who I am. I'm a harmi, not some kind of harmi/haran hybrid. And you don't get as much to choose from--I'm not terribly attracted to desret, so if desret was all there was I'd have to pick between marrying someone I didn't like like that and not being able to have children. And I didn't mean to say that having two genders was worse, just that simpler doesn't necessarily mean better."
"And even if you didn't have spices, you could still have fruit sauces and cheeses and sparkleaf and stuff to give food extra flavor," she shrugs. "There's lots of ways to be a person with the system we have too. I'm not saying you're horribly destitute, or anything, but you're way, way out of anything I've ever seen before. And vice-versa, I assume, I'm sure I'm plenty weird to you."
"...No, of course not. Any desi can get someone pregnant, and any hari can get pregnant, but--wow, I was not expecting to have to tell someone about the swans and the minnows today. A desret can get anyone pregnant who can get pregnant, which is all three hari genders and also desmi. A harret can only get pregnant by a desret or another harret and can get anyone pregnant who can get pregnant. A desan can get a haran or a harmi pregnant. A desmi can get a harmi or another desmi pregnant. Haran and harmi can't get anyone pregnant. Um, have I forgotten anything."
"I wonder how two-gendered people fit into it," she muses, tapping the green marker she was last using against her chin. "Maybe you're too different from us just on account of the genders thing, or maybe your genders aren't compatible, or maybe one of your world's desi could sire a child on someone like me."
"Yeah, that I have no explanation for. I mean, there are people who are born sort of in-between or unusual in some way? Either in how they're shaped or how they feel about it. But they're not common. Also it's not a thing that happens to dragons, we get to sex-select kids and the sex-selection doesn't make mistakes."
"Well...for one thing, the smell thing is a bigger deal than you seem to think it is. It, hm, it doesn't just tell you factually what gender someone is. There's, you know, meaning to it. Like the fact that I have breasts doesn't just tell you factually that I'm a childbearing gender, but also serves as a focus for attraction. And everyone smells differently, so you can tell someone's gender but you can also tell who they are. On I guess a more practical level for someone like you...on average, harmi have larger breasts and wider hips than haran, and desret are a little taller and a little more muscular than a desan, and of course the interfertility thing," she gestures at her chart.
He dances: I am least likely to fall over with this language! The sensation is sort of a cross between actually hearing the sentence in her own language and finding all the motions of the dance self-evidently expressive.
A non-exhaustive list: mono- or non-gendered species; cultures with bimodal sex distributions but no gender roles to speak of; three-sex arrangements, either similar to the sprites of your world or differently balanced; species in which sex and/or gender changes over the lifespan; cultures in which distinctions other than gender strongly overlap with and affect the gendered expectations; species with numbers of meaningfully distinct sexes as high as (in my current span of memory, which is not infinite) 512.
Where they affect pronouns or social expectations in ways relevant to me, yes. The species I am thinking of with 512 sexes would not particularly benefit from assigning me one, as I am made of pleasingly geometrical wood.
"You'd have to, if there were five hundred and twelve options! What if you'd just never met anyone of gender three hundred and eighty-two besides one grandparent and a glimpse of the postal commissioner through a window? What if your cut-rate education only covered seventeen through ninety-five because they needed the rest of the class time for other things? You'd have no idea!"
"For three hundred and eighty two in particular, I mean, and not the rest of ninety-five through four hundred. Four hundred and one through five hundred and twelve being the ones you've met outside of class, of...course...shit, I just realized we're being super racist against some species neither of us is ever going to meet."
"...Uh, if you promise not to add any more people to the marriage, and it's not currently possible for the marriage to produce children, there's some stigma for that, but if you leave open the possibility of adding someone who could make children happen people won't bother you over it even if you never actually do."
"It is very much the normal thing to do in most modern Elcenian human cultures to date around, more often serially than in parallel, in one's teens and twenties, and eventually pick one person to marry and be monogamous with indefinitely. Variations include not doing the 'eventually' part, not being monogamous with your eventually in one fashion or another, and getting divorced because you picked the wrong eventually. And there are cultures - fewer now than there used to be - where they do arranged marriages."
"It's a dragon thing, I think I explained? We live a really long time. ...Oh, uh, possibly relevant is that full-blooded dragons have a stupidly high infant mortality rate? I can't even remember off the top of my head how many times they had to try to get me. So our choices are basically 'marry a series of shorter-lived species, see children live to adulthood reliably' or 'marry another dragon, watch a dozen babies die'. Also people who've never been married before seem to be bad at picking relationships to last four thousand years, dragons who marry other dragons early divorce more than average, so the first marriages are sort of practice? Some folks sidestep most of this problem by marrying vampires, though. They've got flexible lifespans. Divorce problem still exists but infant mortality problem does not."
"I live in a place called Corenta, and there, when two people get married they pick an ancestor's name, first or last, if they're lucky they can find one on both sides of the family, and then that's their last name and their kids' last names. M'cousin lives in Esmaar, and there households all have a last name; when people get married they move into one or the other's house and use that house's name. Or they start a new house and pick either one of the two."