Pallavi Gaikwad - Naz Foundation ( Photo 2 of 4 )

When she isn't teaching in schools and colleges, Pallavi goes to destitute homes whose inhabitants are largely women rescued from brothels.

"They are challenge to deal with," Pallavi says. "For them, all of this is a joke and they often ask us what we'd teach them about sex that they don't already know. It takes a lot to be in control of the situation."

Pallavi recalls an incident when a game of Chinese Whispers turned ugly. "One of the participants changed the message to something so obnoxious my colleague couldn't even say it! We were horrified."