@Ber "I saw someone suggest the world of numenera should be predominantly gay, and I thought the whole concept was pretty funny - since it must be pretty hard to maintain a population without much hetero intercourse.
But then I remembered that the world has lots of ruins from bygone civilisations, and thought maybe one could be from a society that turned all gay, and consequently ran out of new people and died out 
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You have to remember that the civilisations that came before the present one in the world of Numenera are incredibly advanced, their science might as well be magic in our eyes (they do strange, almost unimaginable things, and we have no real chance of understanding how they work - if they were magic it would make no difference to us). That is to say, that while I like the idea of an all gay civilisation - it probes the imaginative and cultural possibilities of such a world - it raises a number of interesting questions that would need to be answered. Presumably these civilisations are so advanced they can artificially inseminate their females or raise foetuses in a lab via an artificial birthing procedure. This in turn presents two very interesting possibilities - either they CAN create new members, but didn't, i.e. they chose to die out and pass on for whatever reason, or they can't, maybe the technology stopped working at some point, e.g. because some newer technology they invented interfered with it, and they were now so far gone that the prospect of mating bodily was repulsive and alien to them and their tastes. Technological development may also not follow a linear framework, i.e. everyone who reaches X level of technological development must have technology relating to issue Y, they're incredibly advanced, but maybe this particular civilisation hadn't developed technology to allow for the things I mentioned earlier - in vitro etc. - because their biology wouldn't allow it, or their technology and advancements simply probe different avenues.
"I know this probably upsets someone because its too heteronormative or something, but sorry I actually laughed thinking about it so I thought I'd share it
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I find it a little crass, but I'm not going to vilify you, psychology is too complex to lapse into that kind of paradigm.
