Law of prostitution.

I hope you are aware of popular actress Shweta Basu arrested in sex racket. My question is that is it really a crime in India. She was in need of money and client who was paying may have paid her the same in exchange of sex. In no way this can be treated as rape right? So why is the police OR law even bothered about what they do of there bodies.It is there soul and there body, they have full right to do whatever they want to unless its not a act of rape against women. Do you feel they should be punished for this? First of all i fail to understand why this is considered as a Crime in India. In case this is a crime then, what is the maximum punishment for both client and Shweta as per new laws in India?