I know of two women (both are related to me) who have had no idea what was going on financially in their own home until the bailiffs came knocking.
Maybe I am a control freak but I cannot imagine being in a relationship where I do not know what was coming in and to a large extent what was going out.
Both of the women I know were married to self- employed men so it was easier for them to hide the financial mess they were getting into but surely in a relationship finances are an open affair even if you don't have joint accounts. Even after the bailiffs came knocking neither women took an interest in the financial affairs of their husbands.
I know another woman who is the only breadwinner yet her DP decides what the money should be spent on and goes mad if she overspends even slightly. I worry that we have not come very far since the days of women’s lib.