Prohibited inter-species procreation - eventually allowed, producing 4th gender. Two of the three genders are bureaucrats, thinkers/builders.

  • Hi, welcome to SF&F! This question is very terse at the moment. Perhaps you could look at the suggestions for questions to see if it jogs any additional details you could edit into your question. – DavidW Mar 9 at 4:35
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    It's a bit confusing the way you talk about "3 gender species." Are you saying that each species was all one gender, and that somehow members of this single gender could reproduce among themselves without needing any other genders? (If so, that seems to be using a strange definition of what a "gender" is.) But are you also saying that the different species/genders could also mate with each other and produce fertile offspring that way? – Lorendiac Mar 9 at 5:18
  • possibly the same as scifi.stackexchange.com/questions/95471/… – Otis Mar 10 at 16:38

The Gods Themselves by Isaac Asimov

Published in 1972, the middle third of the book features an alien species from a parallel reality with three genders: Rationals, Emotionals, and Parentals. Reproduction among these aliens involves one of each type merging together into a single individual with a distinct personality.

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