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Given your clarification and that the fact that androgynes exist in your novel's world, I'll concur with the rest of the answers here -- purposefully concealing it will dissatisfy your readers beca...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27753 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Given your clarification and that the fact that androgynes exist in your novel's world, I'll concur with the rest of the answers here -- purposefully concealing it will dissatisfy your readers because it is pertinent to the plot. The only time I've seen this work is in [Sarah Caudwell](https://en.wikipedia.org/wiki/Sarah_Caudwell)'s Hilary Tamar mysteries, in which the detective is written in such a way that either gender is a possible one. The character's gender is never part of the story, as opposed to your case.