"They're gendered, I... don't know how theoretical that is and if you're nonbinary or something probably nobody will object to you just picking one?" 

"Do you mean intersex or are you seriously suggesting there are trans people here?"

"...I mean I have no reason to believe there wouldn't be?" 

"What about the thing where you were just telling me everyone tells the truth to their allies about all their combat-relevant traits? Or is your expected adult height and muscle mass somehow not relevant."

...

"....so, one, nobody is allies yet it's the first day, people have working relationships at best unless you're in an enclave. Two, while those things are not irrelevant, you.... are aware that there exist tall muscular cis women and short skinny cis men, and this is not, like, unobservable in people, right?"

"I guess." Nothing about Leander makes any sense at all. "Well, I'm not nonbinary. So, bathroom run?"

"Bathroom run!"

He fills up his water jug so he'll have water later, does his very level best to stop thinking about all of the things he told himself he wasn't going to think about, keeps an eye out for mals in crevices, does manage to work up some mana carrying a giant full water jug back, and wonders if every time he meets a new person it's going to be as confusing as this.