I know this subject has a lot of threads about it (this was mainly about the samesex marriages, since thats where i started) deep in the archive, some i have even posted myself in and some had me convinced that the way it is now is indeed the best course of action.
I think some of the most often said reasoning NOT to have this in the game at all would be the "its too much taboo to have in a (this?) game"
that combined with the "it does not matter a big deal, why change the code?"
personally, i find the fact that dwarf fortress is slowly turning into a cultural simulator a sign that these kind of things need to be implemented in some form
be it a sull solid percentage is gay or whatever, to an even duller "everyone is 50/50 bi"
or to a more exiting "its random for every dwarf/elf/we to fall in love with a same sex partner, and different cultures will accept or deny it, maybe even imprisoning the "offenders"
and maybe even a "some cultures/races tolerate it, some bathe in it, some burn you on the stakes for it" kind of deal (i would refrain from a "humans hate it, elves love it kind of deal, and prefer a toss of dice at world creation though)
what better way to make interesting historical events or fortress events then juliette and juliette falling in love, but it is forbidden, therefore being outcasted by the city, later on they both kill a dragon threatening the town and everything cool again for them...
a masterfully engraved image of juliette and juliette the dragon slayers slaying the dragon and regaining there towns approval, juliette and juliette are fornicating on the dragons corpse, the townspeople are rejoicing over the death of the dragon
i mean, dwarf fortress should have all sorts of these things, this is after all a game moving more and more into procedurally generated content to a degree that increases the immersion and storytelling capabilities
basically i feel limiting these things is probably the worst possible choice you can pick, we should be encouraging these things, not just same sex couples, but any sort of "possible double edge taboo behaviour" that really shape and distinguish societies and cultures from each other
i want to see dwarven empires taking over the elves necro-cannibalistic tendencies due to great famines in there past, and the other dwarven empires frowning upon these actions
i want to see men as traders, and other towns refusing to trade with a man, believing this is a womens job just because it has been the job of a women for decades on rows that it would seem weird to suddenly give it to a man
i want to see polygamy, due to a low male birthrate in history in a local region
i want to see drama and culture as its supposed to be, not this "lovely dovely" lets all be conformist crap some people would love to steer towards...
additionally, it would be a great way for dwarven fortress to define itself as an adult game, with diverse adult views on these topics without the game itself judging or steering moral choices or thought the player might have while playing
players dont want to be told what is good and what is evil in a game, personally i would be quite amused with generating a procedural world where (procedurally decided) any gay men are burned on the stake and any gay women is glamorised and idolised, these things are pure and raw culture and are a better way of predicting gays in games then any other game i know of has done so far... yea... i dare you to find a gay game character that was not put in just to be "the gay character", and is not an utter stereotype... games suck on mature topics... even porn... (im not talking about games that "are" porn i'm talking about games "about" porn or at least have a part of there storyline starring something related to porn.. just doesn't happen... unless uber stereotypes are used (playboy the mansion for example)
to be honest and to sum it up in a tldr: i want to see cultural drama procedurally generated, and i want to see it having a cause and an effect for certain civilisations and the more taboo, the better
if anyone is against implementing taboo, then they probably never dug up the shiny blue stuff, or actually read the elven history before... and they should... we already know dwarves can do depraved acts... whatever these are should be determined procedurally and be part of culture and not race properties