Why have your fictional alien species stick to strict cissexism/the human gender binary when you can get creative because aliens????

Like, I have an alien species of my own creation called units and instead of a two gender binary they have a five gender quinary (including non-binary gender concepts such as genderfluidity, of course)

And I definitely don’t slap a pair of tits on the female equivalents since no units have no use for tits… I scream internally when I see cis people put breasts on aliens because their heavy cissexism carries over to their fiction