When I'm using a urinal I'm sure to keep my eyes fixed firmly ahead. After all there is an unwritten contract amongst all males that they will stare intently at the tiles in front of them for the thirty seconds it takes before a short shake and careful repackaging of the equipment. Your eyes should really not be roaming at any point during this procedure.
That's why it was particularly weird the other day when I was taking a piss and a guy complimented me on my watch. It's bad enough that he broke the unwritten contract but then to bring attention to the fact that he was gazing at a spot just centimetres from my exposed wang made me really uncomfortable.