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do you mean the arbitrary designation that has been the sole reason for relationships since the dawn of mankind?
deductive reasoning i believe
humans have been coupling, forming family units, long before they could speak, much less write, draw, etc...
it is a basic instinct, is it not?
When I asked for evidence, I meant evidence that it is the sole reason for relationships. I can think of several reasons that relationships develop, with procreation only one of them, and one not necessarily required. Companionship is one. Power is another. Ego is yet another. As you can see, there are several possible reasons for relationship formation.