This reminds me of a story my hubby told me when he was in Denver, CO.....he went into the mens room to use the urinal, unzipped, and walked up to the urinal then said (with all these guys using the other urinals) "Man, this water is cold!!"
It has to do with the fact that as a guy, when you sit on the terlet, your dick is so long that it hangs down into the water or when you pee in the urinal it's so long that it touches the water.....