Why are couples favored taxwise?

Why do taxes privilege unions of two people (usually married, but also straight or gay de-facto couple nowadays)? Do you think ';progress'; will bring favor to other kinds of multiple unions for ';affectionate'; purpose, such as threesomes, etc? Especially now that the concept of ';couple'; is getting more and more devoid of its purpose of creating a ';family'; with biological children for the proliferation of the human species?Why are couples favored taxwise?
Because they form a society





Societies are ';better'; for tax purposes.

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