My significant other

Hi there,

I need your help with the following phrases:

(1) my best half

(2) my other half

(3) my significant other

(4) domestic partner

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A. Consider the following example:

"My best half/other half/significant other is keen on figure skating whereas I prefer soccer and ice hockey"

I wonder if all the first three versions are just fine here? Which do you think are heard more often in everyday English?

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B. The fourth example is something quite different from (1)-(3)?

I know what "domestic partner" means but I guess .... feel it in my bones ... this phrase can sound impolite or even offensive in some contexts? If you could give me a bit of advice as to how to use (4) ... and not to put my foot in my mouth :-)

One final question. Based on what I 've seen in the internet, the term "domestic parter" became common only in the 20th century... There must be older terms synonymous with "domestic parter"??