First things first: I apologize.
I’m a psychology major. This stuff, to me? Fascinating. It’s like a division of personal identity, a combination of gender and sexuality, and thinking about the way this would impact us if it really existed is ridiculously intriguing to someone like me. So my brain’s going like a hundred miles an hour trying to figure out how a world like this would actually function and what would change and the ways societal and personal perception would adapt and it’s all just…so freaking interesting to me. So, in typical wordsplat fashion I’m COMPLETELY over-thinking something that was pretty much designed so characters could have week-long, animalistic marathon sex.
Also, fair warning, this is not even close to the be all end all of information on this stuff. It was requested that I write an A/B/O fic, and, never having read one or even heard of it, I set out to research it. All of the information below should only be applied to my stories and the way I personally want to write this world, not a hard and fast rule. As with all fanfiction, literally everything below is subject to individual authors’ whims and is in no way universal.
So, the best way to do this is probably with terms. I’ve tried to keep it minimal, but I’m me, so that didn’t really go so well. Feel free to skim.