I think woman should have private saving whether husband is good. For me, I didn't tell my husband how much private saving I have. But when we need to use for our family or my sons. I have no doubt to contribute. My husband and me have another joint saving. He never request to use my money. :-P
Of course we should have private savings la... as i am a working woman, my salary will be my own savings & expenses and my husband won't ask me how much $ i have in my personal bank account... of course i also save $ for my daughter la...