My understanding (based on what a professor with a law degree and experience working in family law told me) is that alimony, child custody, and child support can't be the subject of prenups, and that there's an arbitrary fairness standard that gives the court carte blanche to toss out any provision the judge doesn't like. I left that lecture (and a subsequent discussion in his office) with the impression that prenups can be useful in niche cases (assuming the anti-male bias doesn't fuck you anyway) but offer no protection in the typical divorce rape scenario. I'd be curious to hear your take on this.