The blood-type biology idea could be interesting. What comes to mind is societal efforts to control all of this, once they figured out how to do lab tests. I mean, you'd know from childhood that you could never marry so-and-so, right? That's different from the surprise!puberty! effects you get from sime/gen. The intersections with property and inheritance might change things a lot. I can see variations on the models above caused by this. There's the one that's easy to anticipate because it's familiar--where you have arranged marriages where you may reproduce with somebody but they're not necessarily comfortable, supportive life partners. There, you'd probably get something like the Tragic Courtly Love culture, possibly including trouveres and the whole Euro 14th century blood feuds over who abducted who.
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What comes to mind is societal efforts to control all of this, once they figured out how to do lab tests. I mean, you'd know from childhood that you could never marry so-and-so, right?
That's different from the surprise!puberty! effects you get from sime/gen.
The intersections with property and inheritance might change things a lot.
I can see variations on the models above caused by this.
There's the one that's easy to anticipate because it's familiar--where you have arranged marriages where you may reproduce with somebody but they're not necessarily comfortable, supportive life partners. There, you'd probably get something like the Tragic Courtly Love culture, possibly including trouveres and the whole Euro 14th century blood feuds over who abducted who.