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As of CK3, same sex marriages are allowed with a game setting, and I know same sex affairs were a thing in CK2. Enabling same sex marriages will disable achievements and at first I thought it was about historical accuracy, but it’s actually because it trivializes inheritance management.
No same sex marriages because of historical accuracy, but of course a bear married to a horse could rule the Holy Roman Empire.
You had to both have silly mode turned on and pretty aggressively exploit some coding oversights to make that happen, though.