How to teach family planning to the world's largest population

How do you teach 1.42 billion people family planning?

From Hum Do Humare Do (Us Two Ours Two) to Condom Bindass Bol (Say Condom Freely), India has given birth to many award-winning campaigns which use creative and witty slogans to emphasise problems of rapid population and promote safe sex practices in the country.

The BBC spoke to some creative geniuses behind these ideas.