Has anyone considered the possibility that Mat and Tuon are already married? I know that in some real life cultures, all you have to do to marry a person is say you are married to them or call them your spouse or something. Mat says Tuon is his wife (3 times, actually). Maybe that is all you have to do in Seanchan?
Notice Egeanin's response to this. Instead of saying something like, "What the heck are you talking about?!?!" she says something completely different. I mean, if someone said they were married to someone they weren't married to, wouldn't people be likely to just say, "Whatever!" or "Huh?" But Egeanin says, "You cannot say that! You must not say that!" Of course, she could just mean that in her culture saying something like that about a person of Tuon's status is just an invitation to get your extremities chopped off or something, but I don't think so.
When Mat asks why he can't say these things, no one says anything. Before, Egeanin mentions that "it is death by slow torture to lay hands on the Daughter of the Nine Moons!" So if punishment was all she was talking about when referring to Mat's claim that Tuon is his wife, it isn't unreasonable to assume she would have asserted that again. You know, something like, "You cannot say that if you want to keep your head!" or something. Also, notice Noal laughs. Perhaps he knows Seanchan culture (he is very worldly) and he thinks it is funny that Mat doesn't and has just accidentally gotten married. Most everyone else is just staring at him in shock. Selucia even suddenly agrees to obey him (after a look of consternation), as long as he doesn't hurt Tuon.
Pento McGreno says: I don't believe it. A theory I haven't heard before. Anyway, to get back to the point, I say that it would be very amusing for that to happen, and not unlike Jordan to throw it in. Though I still think that he needs to throw in a threesome with Mat, Tuon and Tylin, or a foursome, with Rand, Ela....no, that's not it. Forget the guys, and just have a huge lesbian orgy. I'm willing to wait for that. 
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