I don't follow how, if you live as a couple, you could ever really determine who earned what and who is dependent on whom?
DH and I have no kids and I still find it complicated.
My DH goes out to work from 9-5. Does he owe me his hourly rate every time I stay in for the plumber, thus allowing him to stay at work and earn it? When he comes home stressed, we chat - does he owe me a therapists' fee? I drive the car because he can't - should I charge him local taxi rate?
I stay home and bring in more or less the same amount of money as a student grant. DH pays 75% council tax as a result (single-person rate, students don't count). Should we each pay half? I get him to proof-read my work - does that come at commercial rate or does it more or less even out against my driving him around?
Our rented house costs us each 335pcm; I was previously paying 400 pcm and he was staying with mates. Which of us gets to spend the saving? Our energy bills are lower than those for two single rooms combined - do I pay more of it because I stay in all day using the heating/electricity, or should he pay more because he likes to put the radio on for hours at the weekend?
IMO, even before you have children, it is a generalization at best, a myth at worst, to believe you can live as a normal, healthy couple and not be mutually dependent, including financially. It just doesn't happen. IMO there is nothing wrong with drawing a line and saying you're comfortable with a certain amount of shared finances but not with sharing everything - but if the way that works out is such that the woman always ends up poorer, I fail to see how you're promoting 'independence'?