Maybe I'm misunderstanding things, but I think both sides could be construed as having a sort of polyamorousness to it. It's just whether it's one male having affection/sexual relations with multiple females (Seekers), or a female having the same with multiple males (Keepers). You could just as easily say it's a duty (You MUST mate with the Nunh vs. You MUST submit to a female's wishes) as well.
It's just vague enough that you can really go either way with it and, as several folks have shown, this can extend to entire tribes as well.
It's just vague enough that you can really go either way with it and, as several folks have shown, this can extend to entire tribes as well.
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