> After all, you do no not seriously headcanon every 2hu as asexual, do you?
So what if I do? I also imagine them not needing to regularly eat, drink or use the toilet. At the risk of stating the obvious, fictional characters aren't real people, and have no obligation to behave like they are. Don't forget also that most of them aren't even human, and those who are are young enough that it wouldn't be surprising if they weren't interested in sex.