What happens when the Soviets watch the Tsar Bomba detonation and decide that they still need more dakka.
For clarity: I've never watched SU. That set to the side, considering this:
Steven Universe is probably the most gayest educational show I know that involve aliens and magic.
Since gems don't have genders, they can't be technically gay. Saying they're gay is basically dumbing down the alien reasoning based on visual appearances.
Rebecca Sugar, the creator of the show, literally said that they were all female.p in term of gender. Ruby and Sapphire have been designed with the idea of them being homosexual, and Pearl had always been designed as bisexual. I could cite sources.
Would it not make more sense to say that they're a unigender species? Homosexuality is only noteworthy for species with options
other than same-sex relations. Also how can they be bisexual with only a single sex? Identifying them as female is workable for the same reason that it works for, say, Asari: people associate traits across species (even if they themselves probably wouldn't think of things in terms of human sexes or genders unless it's blatantly just alien-fetish porn written by humans).
Like, look at how Asimov did the para-universe photosynthetic aliens in
The Gods Themselves. They were a trisex species composed of Rationals, Emotionals, and Parentals, each with pronounced traits (some biologically innate, some left for the reader to decide): Rationals and Emotionals correspond to rather literal transpositions of '50s Western gender roles in some respects, though the nature of the species made them somewhat more strongly biologically differentiated in that Emotionals can pass through solid matter (Rationals can only do it to a limited degree with other living beings) and are the prime actor in reproduction. Then the Parentals, which carry and raise offspring, are only able to blend with the assistance of other individuals. Rationals and Parentals are identified with male pronouns, Emotionals with female pronouns.
There's a whole bunch more stuff, and the plot partially involves the complexities of trinary sexes and relationships, as well as characters breaking gender norms &c. shit. It's a complex, internally consistent, believable depiction of an alien species that really
doesn't correspond to our preconceptions about gender and sex, with just enough intentionally familiar notes for the audience to be able to understand and sympathize with the struggles of the non-human characters. It's always been a shining example of how to do alienness right in my eyes, as opposed to the usual "Human,
but... and Asimov wrote it back in the early '70s.