I had asked this question to many of my friends (only guys). And almost everyone of them told the same answer (See the fist comment).
The question goes as follows...
"You are travelling in your two wheeler in broad daylight on a lonely road. There is nobody in sight and the area is entirely barren. You suddenly feel an urge to take a leak. What is the first thing that you would do, after stopping the vehicle???"
They all told me the same answer I had in mind. Very surprising. In my school days, we conducted a similar survey among guys. We used to catch guys, who are deeply engrossed in something and ask them, "Anna nagar-la yaaru irukka??"... and majority of them told "Aandalu".... That was the time, when "Anna nagar aandalu, ayanavaram gopalu...", gaana song was popular.