Polygamy
While it may be argued, if one man producing more children with multiple women increases his chances or odds for genetic propagation, it directly runs into an objection “Is he taking more than he ought to? From his perspective, the numbers and probability games are justified, however ethically lacking integrity.
Monogamy
This version reminds me of a quote, I apologise for not remembering, from whom, at this point in time.
“Quiet men live in desperation” for it makes up for having discovered a version of truth. The pursuit of a monogamous relationship although makes no sense from a logical or probabilistic point of view, but ought to cover for a relatively, an ethical point of view.