Deuteronomy 22:28–29.

“If a man meets a virgin who is not betrothed, and seizes her and lies with her, and they are found, then the man who lay with her shall give to the father of the young woman fifty shekels of silver, and she shall be his wife because he has violated her. He may not divorce her all his days.”

Rapin' is ok if she doesn't belong to someone else (theft) and you have $50. Also HIS penalty is that HE has to marry HER.