Is it immoral?
Why?
What if she's totally asking for it?
Let's see what god has to say on the subject:
awwww yeah, rape bitches and then marry 'em~If a man is caught in the act of raping a young woman who is not engaged, he must pay fifty pieces of silver to her father. Then he must marry the young woman because he violated her, and he will never be allowed to divorce her. - Book of Deuteronomy