You May Find Portions of This Offensive

You know how when you're thinking about buying a new car and suddenly start to notice the make of every car that's parked on the street? Or how when you're hoping to get pregnant and all you see are babies everywhere? 

This is not that. 

The other night, when I stayed up late with Sam to watch one of the playoff games between the Red Sox and the Tampa Bay Rays, every time the camera panned to another player or coach, he was spitting. It was like a contagion. Except it was behavior as usual. Just in case you don't get the full picture of what I'm talking about, Terry Francona, the manager of the Sox, took a sip of something from a cup--Gatorade, Sam said--and then he spit it out. 

"Why'd he do that?" I asked Sam.

Sam: "He's rinsing his mouth out."

Me (to myself): Isn't that what the bathroom sink of for?

I chew gum, drink drinks, play catch, but do I ever spit? NO! And it's not just ballplayers who do it--it's men! I can honestly say that unless a woman is trying to expel an errant insect that flew into her mouth, I have never seen the fairer sex spit. 

Maybe dads take their sons aside and tell them that spitting is a good idea, but then why does the mom message, Don't do it!, hold no sway? 

So here's my question: WHY DO MEN THINK SPITTING IS A MUST?