Why do guys spit?

Niello
Is it so hard to swallow it? Just today I had to avoid the spit on the sidewalk. And it's always guys, no girls spit. Disgusting. Like what do you do if you're in someones house "Ah shit I have to spit, I'll just spit here" It's flavorless and not hard to swallow.
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Why do guys spit?
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