I'm saying that

1) He should be proactively making sure she gets a fair deal, otherwise he is signaling his own poor quality as head of house.

2) Private contracts, with no means enforcement, are not a fair deal, because women have no means of enforcement, by their very Nature.

There needs to be something in writing (with witnesses), and some place she can take it to plead her case and have men enforce the clauses. Whether that be a private mediator, a public court, a council of elders or ecclesiastical court, etc.