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Supposing there are a Jewish man and woman who are the only survivors of a crash landing near a deserted island, and their respective families have written them off for dead. Over time as they struggle to survive, they fall in love. According to a previously answered question they cannot have a full Jewish marriage due to lack of witnesses.

This question asks: Can they contract any lesser type of marriage? Or does the Law strictly require the pair live chastely until they die of old age?

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The halakhic answer is as noted at the answer above. I also want to point out that there is a well-known Jewish folktale, first found in a manuscript of Midrash Tanhuma, about a king (usually Solomon) who locks his daughter in a tower but her destined husband finds her and they marry with Gabriel and Michael (or heaven and earth, in other versions) as witnesses. There's also the Talmudic story (Ta'anit 8a) of a man and woman who are betrothed with a well and a weasel as witnesses. –  Noam Sienna Oct 14 '13 at 1:19
I restated the question. Are there any forms of marriage which are less than fully halakhic that a stranded couple could be allowed to agreed to? –  Andrew Jonathan Oct 14 '13 at 2:29
@NoamSienna I will restrain myself and simply say that you are getting the Gemara in Taanit WRONG WRONG WRONG WRONG WRONG. The Gemara is talking about making good on your word, and in that context mentions a story of a couple who pledged that they would in the future marry each other. "The weasel and the well" would testify about the pledge if either side denied it, but the binding force here is simply that of a vow, no different than if I promised not to eat potato chips -- no witnesses needed. They were NOT married at that point! Her crime was breaking a promise, not adultery. –  Shalom Oct 15 '13 at 16:18
@AndrewJonathan FORGET THE PROMISE!!! There is no marriage here. Anything they would do is premarital relations. –  Shalom Oct 15 '13 at 18:46
@AndrewJonathan Shalom is telling you what Judaism says about this. If you want to make up on your own what you think God and the Bible say, you are more than welcome to do so to your heart's content on some other site. –  Double AA Oct 15 '13 at 19:02

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The question is silly, but I can help you reorient it a bit. The halachic definition of marriage needs two witnesses, and Noahides require that it be clearly known to society that she's his wife. Neither works here. Nor do I know or care why a "Noahide definition" or "Edenic definition" would matter here.

The wiser question is -- "would a couple in this situation be expected to observe the prohibition on non-marital relations"? From a technical legal standpoint is one question (e.g. if we don't follow Rambam's opinion it's a rabbinic prohibition, which has more leeway); in terms of how G-d would judge them is another.

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There is no reason Noahides on an island couldn't marry, but that wouldn't help for Jews –  wfb Oct 15 '13 at 17:05

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