There's no reason not to put in variant ethics when it comes to homosexual acceptance. It's true that Dwarf Fortress technology doesn't extend beyond the 14th century (pump stacks that spew magma out over the countryside notwithstanding), but to say that society standards should necessarily be held to the same standards, I'd say no. For one thing, it just isn't our world (oh rly?).
I'd also like to point out that we have completely anachronistic gender equality right now.
As in, it's not even in our
own so-called enlightened times we have the sort of nigh-absolute gender equality we see in DF.
Women are not only not expected to fill different social roles in the game, and aren't subject to notions that women are more "hysterical" than men, but they are pretty much forced by modding fiat to not be recognized by the game to be in almost any way different
at all.
There is no pay discrimination, no glass ceiling, no maternity leave (which can actually be a little disturbing when pregnancies occur mid-combat), no periods, men can wear dresses and thongs, and nobody even notices. In fact, you can make your whole society go nude, and nobody really minds men and women, children and elderly, being naked together all the time.
We are, frankly,
unrealistically liberal about the whole notion of gender equality in this game.
Likewise, we are being
unrealistically prudish about the entire concept of sexuality in this game - to the point of not really even modeling
heterosexual relationships very well. Once married, dwarves don't even have to talk to one another again, they just waft some spores into the air after every pregnancy to keep the women eternally pregnant. Sure, we don't need dwarves "doing it", but they could, I don't know, sit down and eat dinner together once in a while or something. (At least buy her a drink before you knock her up again, geez.)
In fact, I'll just leave this
Extra Credits link on sex in games right here...
What we need is not graphic displays of sex, but rather displays of
intimacy. (And I mean that in "aww, they're holding hands" terms, not "get a room" terms.)
We need dwarves who are in relationships taking time out to spend time with their loved ones, rather than getting married to the first person they manage to stand around the dining hall near long enough to get 300 relationship points with, ignoring their spouse from then on, and then ignoring their children that follow them around like ducklings, even into the middle of an onrushing horde of trolls.
We need dwarves who take time out to connect with one another, especially after some of the horrific things that happen in DF, like attacks from flying zombie heads coming up out of the well in the hospital and eating the doctor in the middle of surgery.
Having that sort of intimacy, where dwarves try to take time out to spend with the people they like or do the things they like instead of operating as color-coded robots, even if it's just two male dwarves whose relationship levels go past "friends" into "lovers" in a screen most people will never notice, is just the first step in the right direction.