Erm, if the girl is attractive, I would just say "sure, but you have to go out on a date with me this evening"
If she is ugly, just asks if she can borrow something just say, "Maybe, what can you offer in return?" If the offer is good, say "yes", but if the offer is bad, say "no".
If she is ugly, just asks if she can borrow something just say, "Maybe, what can you offer in return?" If the offer is good, say "yes", but if the offer is bad, say "no".