[momonae]

Spoiler for Comparison to the novel:

I don't remember the novel or anime said the society expects adolescents to have a same-sex lover. I only remember when the minoshiro said scientists felt the need to change the society to the one like bonobo's, the kids were dumbfounded and Maria asked the minoshiro that it was not like the bonobo's back then in the novel.

By the way, I'm surprised so many people care about the characters so much. For me, this anime/novel is uniquely interesting because the characters didn't interest me at all, at least until the very end of the novel.