Why are rapists placed in the same category as murders?

Taking a life is much more severe than having unwanted sex with someone. I partly agree if the rape was violent and followed by a beating. Then the criminal should be in jail for a long time. But if the rapist was gentle and restrained the receiver without any harm inflicted I would place the crime in the area of a robbery. Sure it's a minor inconvenience but if no harm came out of it the person should do the time that fits the crime. 2 years probation sounds fair.