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I don't think it's alienating, but it does press my suspension of disbelief a bit to have such a large fraction of the cast be LGBT characters. Gays are something like 3-5% of the population, with ...
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Source: https://writers.stackexchange.com/a/41082 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I don't think it's alienating, but it does press my suspension of disbelief a bit to have such a large fraction of the cast be LGBT characters. Gays are something like 3-5% of the population, with the rest of the letters being an even smaller fraction. Having a group of four LGBT characters with no heterosexual ones is unrealistic unless they are together _because_ they are LGBT. Admittedly, a post-apocalyptic society would be fairly Malthusian and thus likely to put a large emphasis on reproduction, meaning them being outcasts for being LGBT is quite reasonable. So if something like this is part of their backstory, then that's totally fine. But if they're a group of survivors that just _happen_ to fill in the acronym I'm going to be rolling my eyes. The skin color thing would depend on where the story is set. For example, in post-apocalyptic America, just about any racial makeup is perfectly reasonable. Post-apocalyptic China or Russia, I'd be scratching my head as to where this diversity is coming from.