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Avraham asks his servant Eliezer to place his hand under his thigh to swear an oath regarding finding a daughter for his son. Chazal explain that he asked him to hold his (Avraham's) milah (male member) while swearing because it was a mitzvah item (similar to how in a rabbinic court one would need to hold a sefer torah) and that mitzvah was beloved to Avraham.

But was this really appropriate from a tzniut perspective? Moreover couldn't Eliezer have held the stone which Avraham used to perform the bris milah instead? Furthermore there is no indication in the text that the mitzvah of milah was more beloved to Avraham than, say, the mitzvah of welcoming guest. Why not instead have Eliezer swear while holding onto the entrance to the tent?

In short, please explain the necessity of the unusual process of this oath beyond the basic explanation given by the commentators.

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are you sure this is unique to Abraham and not a general Near Eastern thing? – Charles Koppelman Nov 5 '12 at 17:12
the ibn ezra says sitting on someones hand was a sign of subservience. the better question is why eliezer had to swear in a jewish way at all? do we make goyim hold a torah in court? – sheimot Nov 5 '12 at 18:12
@sheimot that's a fair question but a different one, feel free to ask it. – user1668 Nov 5 '12 at 20:02

From here:

This explains a curious detail of Abraham's behavior related by the Torah. When Abraham wanted his servant, Eliezer, to take an oath, he told him to "place your hand under my thigh"(Genesis 24:2). An oath is taken while holding a sacred object such as a Torah scroll or tefillin; here Abraham is telling Eliezer to swear on the part of his own body sanctified by the mitzvah of circumcision. Yet our sages tell us that "Abraham observed the entire Torah" though it was yet to be given [at Sinai]; so Abraham studied Torah, put on tefillin, affixed a mezuzah on his doorpost, etc. It would therefore seem that he had no shortage of "sacred objects" available to him. Why, then, did he have Eliezer place his hand "under his thigh," contrary to all common standards of modesty and propriety?

But as explained above, the import of Abraham's pre-Sinai mitzvot were of a wholly spiritual nature. Since G-d had not commanded him to do them, they remained human deeds, subject to the natural law that separated the spiritual from the material; while they had a profound effect on his own soul, the souls of his descendants, and the spiritual essence of creation, they had no impact on the material substance of the universe. The single exception was the mitzvah of circumcision, whose commandment by G-d constituted an empowerment to sanctify the physical. Thus, this was indeed the only sacred object available to Abraham.

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I'd also read "place your hand beneath my loin" as "you must put the needs of my progeny before your own interests." (As in "yad hekdesh al ha'elyona")

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