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Luthien chose to be mortal after her 'death' so that she could be with Beren. Arwen, as a half-elven had the choice as all half-elvens did to be either of the race of Men or Elves and she chose to be mortal to be with Aragorn. It's a bit unfair that half-elven have that choice but the descendents of Elros didn't.
That is because you are looking at the choice from the wrong perspective, assuming Elven immortality is better than the fate of Men. That was not meant to be the case. The fate of Men was a Gift from Eru. It was supposed to be something that far outweighed immortality. That is why Elrond's children are given the choice and Elros's aren't. Elrond had turned down the Gift, but his children still had human blood in their veins. The Gift was not denied to them just because their father had turned it down. Elros, on the other hand, had accepted the Gift. His children, therefore, did not "have to apply" to be mortal and join Eru in heaven. That Gift had already been granted.
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I think the only documented intermarriages were Luthien and Beren, Tuor and Idril and Aragorn and Arwen.
There was also Imrazor the Numenorian and the Elf-maiden Mithrellas, from whom Imrahil, Boromir and Faramir all gained their (very diluted) Elven blood.
This fourth union between Human and Elf does seem to highlight something, in that it is less documented than the other three. The other three are all unions between Elven princesses and human heroes/nobility. Imrazor was a marinor who was father to the first Lord of Dol Amroth. Mithrellas was a Silvan Elf who was a handmaiden of Nimrodel. Maybe the others got documented because they were more important than Imrazor and Mithrellas, not just because they formed Elf/Human relationships. If this is the case maybe Elf/Human relationships were more common than we are aware of, but Tolkien did not deem it necessary to document them all. Taking this a step further, maybe these relationships went both ways.Tolkien based a lot of his work on European/Scandanavian legends. Many legends concerning Faerie often portray Elven youths "frolicking" with innocent young girls. If Elven males in Middle Earth formed relationships with Human females, maybe this is more the nature it would take.
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Do you think he would also have to make the 'choice of Luthien' upon taking a human mate?
The Gift of Man could not be taken away as it was a gift from Eru himself. The human half of the relationship could not be made immortal therefore (Tuor was said to have gone to Valinor, but he would have still been mortal as the Valar did not have the power to take the Gift from him). If the Elven half of the relationship wished to stay with their loved one, therefore, they would have to become mortal. It does say of Luthien, however....
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So it was that alone of the Eldalie she has died indeed, and left the world long ago.
To me, that implies that Luthien was the only Elf to actually die and leave the confines of Ea, to which all other Elves are bound. Arwen received the Gift because she had Human blood, but it would seem any other Elves would have to wave goodbye to their loved ones forever, because they did not get to join their spouse during the singing of the Second Great Music.