You have misread the Bible.* The result of premarital consensual sex was marriage. The result of rape was death.
*I don't blame you; it's a mistranslation in the NIV.
From King James version:
"Then the man that lay with her shall give unto the damsel's father fifty shekels of silver, and she shall be his wife; because he hath humbled her, he may not put her away all his days. "
From the American Standard version:
"If a man find a damsel that is a virgin, that is not betrothed, and lay hold on her, and lie with her, and they be found; 22:29 then the man that lay with her shall give unto the damsel’s father fifty shekels of silver, and she shall be his wife, because he hath humbled her; he may not put her away all his days."
From the New American Standard Version:
"then the man who lay with her shall give to the girl's father fifty shekels of silver, and she shall become his wife because he has violated her; he cannot divorce her all his days."
From the New King James Version:
"If a man finds a young woman who is a virgin, who is not betrothed, and he seizes her and lies with her, and they are found out, 29 then the man who lay with her shall give to the young woman’s father fifty shekels of silver, and she shall be his wife because he has humbled her; he shall not be permitted to divorce her all his days."
edit: oh wait, just found this in KJV:
"But if a man find a betrothed damsel in the field, and the man force her, and lie with her: then the man only that lay with her shall die. " which is separate from what I posted, "If he LAY with her"
so Avalon, I will give you that one if you follow the KJV (which is not the version of the Bible I had or learned from). Thanks for pointing that out to me, that is definitely good information. Do you have insight as to why the KJV version differs from the NKJV? The use of the word "seize" in the NKJV implies non consent to me.