There's a cultural tendency to rationalize bad female behavior, IE, eschewing marriage for serial monogamy/hypergamy, because of some evo-psy explanation.

The implication from those who argue that is that it's normal and a fact of life. Well, it's also a fact of life that for the vast majority of human history, female consent never mattered. Men fought other men, and the winner got all the women whether they liked it or not. Even if Evo-Psy is correct (it's mostly bullshit), should we be indulging the base or expecting better from people?

What are the implications of behaving like animals? Evolution made men physically stronger than women.

If women ruining their family to sleep with a stranger who is better looking or whatever is legal and ok, what is to stop men using their superior physical prowess to simply take women on the street when they feel like it? Both acts are wrong because they hurt others and ruin lives. But one is legal (no fault divorce) and the other is not (forced sexual encounters).