Couple having sex on moving motorbike caught by police after photo went viral

Imagine this! A couple who were photographed having sex on a moving motorbike (is that even possible?) traveling along a public road in India have been caught after a shocked motorist driving behind them took a photo and shared it on Facebook.
The man shared the photo and wrote "Have sex riding a bike ... No one will stop you ... This is Goa ... This broad daylight sex show took place right on the Mandovi bridge on Sunday afternoon. Not a single policeman on the way to stop them. A passer-by happened to click this picture. What do you have to say?"
After the pic went viral, Goa police swung into action and tracked down the couple using their number plate. But I don't even know why they bothered to because when they found the couple, they only fined them 1,000 Rs which is about $15.