CNBC: More Couples Arguing About Money, Sneaking Purchases:
Another interesting tidbit is one in five women who are in a relationship admit to hiding purchases from their partner. The number rises even further when you ask people if they have ever hidden purchases from their spouse, with three in five people admitting they bought items on the sly.

The article makes no mention of how many men hid purchases from wives but I did find another related CNBC article that said women ages 35-44 hide the most small purchases from their spouse (23%). Women ages 18-34 were also more likely to hide cash and at 20 percent, women aged 35-44 are almost twice as likely as any other age or gender group to hide bills. However, men aged 45-54 are the most likely at 9 percent to hide major purchases from a partner.

Have you ever hidden financial information from a partner or had your partner hide finances from you?