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I'm not asking about the function of expectations of fidelity nor how it arose in the past. I'm asking whether it is a wise expectation to continue to have now, given the changes in technology available to us.

Well see, this requirement of fidelity - so that men could know which children were theirs - has been baked into humanity for a very long time. The fact that technology changes overnight doesn't mean human nature can also turn on a dime.