Doggy Style Re-Defined

So I was driving by

I saw them attached from behind like this,

I wondered and I drove back . . . .

Are you kidding me?

How does it work then?

In daylight and in the middle of the street?

Metro Maps of the World

 Barcelona: 1.7 Million

 Madrid: 3.3 Million

Moscow: 11 Million

 Paris: 11.5 Million

 Tehran: 9 Million

 Tokyo: 13 Million

L ondon: 8 Millions

World Cities Populations