The recent investigations by Tehelka.com have shown that not just the rapists, but even the police and the society don’t seem to be aware that forced sex is rape (and a crime).
Many also seem to believe that rape is a natural result of a man finding a woman attractive (‘getting provoked’); most of the police (and probably many rapists) don’t seem to know that a woman who has had sex with more than one man still has the legal right to say no to other men.
They also seem to be unaware that women can consume alcohol (or talk, laugh, dance etc) in company of men without requiring to have sex with any or all of them.
Where is so much confusion and ignorance about rape coming from?
I think victim-blaming is the culprit.
Victim blaming can confuse rapists, police and the society about when exactly does forced-sex become a crime. [Victim blaming also discourages the victims (and their families) from reporting rapes.]
Police confirmed that rapists often don’t see rapes as crimes, and don’t expect the victims to report them. [link]
(Legally, non-consensual sex is always a crime (except marital rape?), even with a sex worker, but the Police seems to be quite unaware of, or unconvinced about this.)
The rapists often don’t see their actions as crimes, the police said, and don’t expect the victims to report them.