What is your reasoning for the dislike of serial monogamy and extramarital sex? If your concerns are primarily focused on the continuation of nations/states through good childraising, I would expect an exception for extramarital sex that occurs without damaging the ability of a family to raise healthy productive kids. Privacy of one’s own bedroom and all that?
Something like that, which is why I haven’t heavily pushed policy along these lines, as I haven’t as heavily considered it and I’m hesitant to bring the iron hand of the state down and accidentally break something.
Some sort of new policy paradigm would be more appropriate, but I haven’t developed one in this case.