User blog comment:TheBlueSlug/Who should issei end up with?/@comment-115.133.205.90-20130725042100/@comment-9339850-20130725045120

i believe the word you wanted was, Polygamy. Mono means one, Poly means many. And i wouldnt say it is impossible as you put it; Lord Gremory and Phenex only have one wife, Sirzechs is devoted to Grayfia, the only person that i know so far that has multiple wives is Lord Bael (and he only has 2), so its probably more uncommon than you think, at least surrounding the characters we know... theres still a lot more demons that the ones we know but i dont think many of them are polygamous probably due to pride in pure blooded families.