This is one of those things that nobody is willing to talk about, but something has to be done about it.
Jasmeen Patheja has started the Blank Noise project to address street harassment, commonly known as eve teasing.
More information is in this Deccan Herald article.
If you think eve teasing doesn't happen and you want to turn a blind eye towards it, read about Hemangini's experience in a train to Chennai, and think again.
Update: I never knew eve teasing was an India-specific term.