Rape is Worse Than Murder
Rape is a crime that has been continuously on the rise as the morals of society decline and the religious values deteriorate. The Quran looks down with disgrace on all sexual crimes.
Rape is different from adultery or fornication where there is a consensual agreement on having sex. It is also different from prostitution where sex is paid for. Rape involves an attempt to empower a weaker individual to accept unwillingly the sexual advance of the attacker. Most sociologists look at rape as being a violent crime that is based on the oppression of another person. God in the Quran, condemns all the elements that constitute the crime of rape.
God strongly condemns any kind of sexual relationship outside of marriage.
You shall maintain chastity, not committing adultery, nor taking secret lovers. Anyone who rejects faith, all his work will be in vain, and in the Hereafter he will be with the losers. (Quran 5:5)
Tell the believing men that they shall subdue their eyes (and not stare at the women), and to maintain their chastity. This is purer for them. God is fully Cognizant of everything they do. (Quran 24:30)
And tell the believing women to subdue their eyes, and maintain their chastity. (Quran 24:31)
In addition to condemnation of fornication/adultery as we can see above, God strongly condemns "oppression". God in the Quran describes oppression as "worse than murder." This puts rape among one of the worst crimes committed by a human being in the sight of God.
Oppression is worse than murder. (Quran 2:191)
God in the Quran also condemns prostitution, especially if force is a factor, which makes it different from consensual prostitution. Both kinds are obviously condemned but forced prostitution changes the entire nature into a rape crime.
You shall not force your girls to commit prostitution, seeking the materials of this world, if they wish to be chaste. If anyone forces them, then God, seeing that they are forced, is Forgiver, Merciful. (Quran 24:33)
From the above Quranic position we see that rape is a hideous crime in the sight of God. The punishment for such crime however was not assigned any one specific punishment to allow every case to be judged individually and according to every community standard.