In the Mass Effect universe, the Asari are universally compatible for mating with other species, even regardless of gender. So, it makes sense that they are the most prominent species involved when one tries to come up with a list of inter-species relations.

However, I'm curious to know if there have ever been any well-known, successful inter-species relationships (aside from those Shepard him/herself can commit to) that do not involve an Asari.

I do recall, in Mass Effect 2, a Turian was flirting with a Quarian and mentioned a movie that featured a Turian/Quarian relationship. What I'm looking for is something a little more concrete - a non-fictional (in-universe) long-term romance between two non-Asari races.

Bonus points if the relationship resulted in offspring.

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    What's "successful" supposed to mean in the title? That seems to imply the important part of your question is about mating/offspring, but your question body has that as a mere footnote. – user1027 Jan 28 '13 at 18:53
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    Successful meaning it's more than just a one-night stand or casual flirting. Ideally it would entail a marriage or offspring, but not necessarily. – Iszi Jan 28 '13 at 19:04
  • It seems you are projecting your human morals and expectations on these non-human beings... What if one or both of the species have no cultural expectation for such relationships? – user1027 Jan 28 '13 at 19:07
  • @Keen I can't think of an example species from the Mass Effect universe, other than some humans, where it is particularly noted that a one-night stand not intended to result in offspring would constitute a successful relationship. – Iszi Jan 28 '13 at 19:19

Tali and Garrus will hook up in Mass Effect 3, if Shepard doesn't have a relationship with either of them.

Joker and EDI will also end up in a relationship if pushed by Shepard in that direction.

Also, the Fornax publication implies that there is a subculture interested in interspecies relations.

  • Good examples, but these are really a bit too late in the chronology to already be calling them "long term". – Iszi Jan 28 '13 at 17:30
  • My Tali and Garrus didn't hook up. :( – eidylon Jan 28 '13 at 17:35
  • @eidylon That just sounds... wrong. – Iszi Jan 28 '13 at 17:38
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    @Iszi Long term would have different meanings depending on the races involved. Salarians live to be 50 or 60 max, where as humans (and Turians?) will hit 1 to 2 centuries. Krogans and Asari, however, can live to be several centuries old, hitting the millennium mark. – Xantec Jan 28 '13 at 17:39
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    @eidylon Oh yea. he was injured when Cerberus attacked the Citadel, so she sold her air car to buy him top of the line armor. – Xantec Jan 28 '13 at 18:48

I’m not aware of any long-term inter-species relationship mentioned in the ME universe (games or books), unless it involved an Asari or Shepard. There is certainly no mention of inter-species offspring, hybrids or half-bloods. Again, with the exception of Asari.

A (romantic) relationship is certainly not impossible. The comments/answers already mentioned the prime examples from the games. The Human female in ME3 obviously caring for a Salarian. Enough to buy him expensive armor to keep him save. Or the Turian in ME2, trying to convince his Quarian friend that she should date someone compatible to her – which means him. And of course Tali and Garrus if none of them are involved with Shepard.

These were not relationships however, but rather the possibility of one.
So it’s not uncommon in the ME universe to find someone of another species attractive. But it’s also not the norm. Most species seem to keep to themselves, with the exception of the Asari.
For them, relationships with other species are the norm while relationships with the same species are looked down upon.
Asari are special. Not only are they in a sense universally compatible, they are also apparently attractive to most other species. Which is a curiosity in itself.

But even if there was such a relationship, interbreeding would most likely be impossible. It’s not really clear if any of the species have compatible sexual organs.
Salarians apparently lay eggs, for example. How would another species fertilize these? Even if they are compatible in such a way, it’s not said that they could successfully mix their DNA.
Both Turians and Quarians are dextro-amino based. While they have this in common, it basically only means they can eat the same food. But they might be biologically incompatible otherwise. I believe this is never clearly stated.
And Krogans would most assuredly have tried to get offspring like this, if it were possible.

We know that humans can’t interbreed with other species from our planet (at least not that I know of). Otherwise we would have hybrids running around everywhere. So it should be even harder with a species from another planet which might have a totally different genetic makeup.

Asari have a unique method of procreation which allows them to circumvent such natural barriers. They extract the genes of the father (can be male or female) and mix them with their own. And they don't even need to have intercourse to do this.
Edit: According to the wiki they don't extract the genes but use the father as a map to rearange a copy of their own DNA.

This is why Asari always give birth to Asari and not to hybrids. And this is why they are in a unique position to have such successful relationships with other species.

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    Regarding inter-species mating compatibility: It may be worth noting that Mordin Solus will offer advice regarding physical intimacy between Humans and Turian/Drell/Quarian mates. While the advice includes information about physiology and "comfortable positions", it does not go so far as to actually say the species are sexually compatible in any physical or genetic manner. (Point being that physical compatibility is not the same as genetic compatibility, and not even actually necessary for "casual" sexual relations.) – Iszi Jan 29 '13 at 16:03
  • tits on a hanar, anyone? also, in ME3, Mordin tries to convince Eve that Garrus is mate-erial. – Matthew Morrone Mar 20 '17 at 6:26

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