My girlfriend does, mainly because she doesn't work at the moment as she looks after our daughter full time.
I give her money every month on pay day but she will sometimes run out and then has an issue with asking for more. I'll then ask her to pick something up or top the car up while she's out, she'll confess to being skint and so she takes my card as I cannot transfer cash and it hit her account quickly enough.
I don't see it as an issue at all, she needs both the card and the PIN to spend anything and i only give her the card when she needs it.