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The first requirement for getting men to raise children was that the men be satisfied that the children they were raising were indeed their own.

We now have DNA tests for that. See: any random episode of Jerry Springer.

You wouldn't even be asking these questions before ubiquitous birth control and paternity tests, the function of fidelity would be obvious.

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.