The term for when both married persons agree that all tasks of the relationship are negotiable and thus shared is:.

Polyamory

Explanation:

In simple words, Polyamory, with the mutual agreement of all individuals concerned, is the nature of or preference for romantic partnerships with even more than one person. It's been defined as non that is voluntary, transparent and accountable". Thus, from the above we can conclude that the correct answer is polyamory.

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