I couldn't recall ever having heard anything about marriage in Inuit culture, but I found via Google that the popular topic there is the matter of wife swapping/trading.
There's a .pdf paper from 1971 (when Inuit were still eskimo) on the topic here - and it makes for interesting reading, not only for the wife swapping parts, but also the picture it paints of how dangerous it was for an eskimo/Inuit man to meet a stranger in the middle of nowhere. (Unless the other guy was recognized pretty quickly, it was usually a matter of run away, or kill or be killed, apparently.) Doesn't sound very "noble savage" at all.
More discussion about it can be found at this 1961 paper.
Both make the point that the half siblings produced by these arrangements felt a special bond - quite a bit different from the "mixed family" issues we see in the West.
For those who can't be bothered following the links, I'll post a brief wiki explanation here:
Among the Inuit, a very specialized and socially-circumscribed form of wife-sharing was practiced. When hunters were away, they would often stumble into the tribal lands of other tribes, and be subject to death for the offense. But, when they could show a "relationship" by virtue of a man, father or grandfather who had sex with their wife, mother or other female relatives, the wandering hunter was then regarded as family. The Inuit had specific terminology and language describing the complex relationships that emerged from this practice of wife sharing. A man called another man "aipak," or "other me," if the man had sex with his wife. Thus, in their conception, this other man having sex with one's wife was just "another me."[36]None of these studies discuss what the wives actually thought of the arrangement - the implication seems to be that they didn't mind the variety - but surely they must have been resentful at some of their husband's loser mates visiting and claiming rights.
As for gay marriage, or even recognition of homosexuality, it seems that some modern Inuit thinks it's very un-traditional and against their culture. I guess the counter to that, for the same sex marriage advocate, is that perhaps a culture that flourished by socially endorsed wife swapping shouldn't really be complaining too much about what others think is acceptable within marriage...