Then that would be trade
She is trading sex and companionship (services) for money (a good) so that would be trade.And there are other family/domestic situations which occur, otherwise you wouldn't get the "trophy wife" phenomenon. The woman didn't choose the hunkiest male most able to physically bring home the bacon to mate with. She chose the guy with plenty of dosh so she could have more new pairs of shoes. That's trade, no?
But feeding your kids isn't trade (for normal people) because no exchange is taking place. If your kids only get to eat if they do chores then that would be trade.