i just really couldn't, i've heard stories of girls using men just to buy them things and i really can't see how they can do that. could you imagine yourself doing it? what would you do if the person you asked said no?
However, I defy any man to disagree that he wouldn't buy a girl something if he thought it meant that doing so would result in the girl demonstrating her gratitude physically...
If someone I knew well had the resources to be able to help me out of a sticky financial situation and I was confident that I could either pay them back or help them out similarly, then yes.