There's no right nor wrong...Its just personal preferences.

If the girl doesnt mind to take money from her bf, and her bf willingly give her money to use then whats wrong about that?

U cant satisfy everyone u know?
If u say the girl is a biatch coz not working and use bf money, another person can say the guy is a loser cant afford to spend money on his gf if he let her gf work.
This goes the same for married couple.

Either way, u cant satisfy everybody...
The only thing is to choose what is the best comfortable choice to you.