I do that out of love. I would not help my male friends that way. Prepare to graduate. If you have extra cash, invest in therapy or a mutual fund. If you're afraid of losing someone because you've closed your wallet, you're paying that person to remain a friend.
Sex belongs in intimate, committed relationships.
Don't root yourself in a sexless relationship because you're hungry for emotional and mental intimacy. Enjoy the friendship and keep looking for a full partner. Tension is released through arguing. Don't imagine that through your steadfastness she will change her sexual orientation. That's not sane.