Spit where you piss

I've noticed that some men upon visiting a urinal initiate the process by first spitting into it, sometimes hocking up a collection of phlegm to make it really count. I've noticed some doing it every time we happen to visit the men's room together. I'm not in the routine of doing this and for some reason today I was pondering the possible reasons for the practice. Could it be for one of these reasons?

• physiological: perhaps some class of males have excited salivary glands that overproduce when the bladder gets full.
• pavlovian: perhaps something about urinals and urinating subconsciously makes some men's mouths water.
• practicality: perhaps some men dislike excess saliva but are too cultured to spit just anywhere so they save it until they hit the men's room where it is a reasonable place to expel the excess.
• habit: perhaps nights at the pub or restaurant where one sometimes feels the need to clear the palette, and practically so in the men's room, has created a routine that keeps going.
• image: maybe it's considered cool or there's a secret society where spitting in the urinal is a call sign.

I've seen it happen mostly at bars and eating establishments but also at work and other public places. Every once in a while it occurs to me to maybe do it myself. But, like most women I observe, I don't spit very often. I wonder, do women do anything like this when they visit the restrooms?