TL;DR: poor men will only do for women whatever is necessary to get laid, these days, almost nothing is necessary anymore so they do just that. Rich men need ch

TL;DR: poor men will only do for women whatever is necessary to get laid, these days, almost nothing is necessary anymore so they do just that. Rich men need children who are aware of who they are and get decent upbringing, to pass down their wealth, so they care for their children a lot better. With poor men having nothing to pass on, and also realising their lives are a failure and it doesn't make their kids a good service to pass on their life habits to the kids, why would they bother?