I is a college student.

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A blonde orders a beer.  The bartender fills the mug and slides it down the bar.  It hits the blonde woman's boobs and splashes all over them.  The bartender goes over retrieves the mug and licks the beer off her boobs.  Each time the blonde calls for another beer this happens.

So, after the third beer, a guy at the bar decides to help out the bartender.  The next time the bartender hit her boobs, the jumps up and starts to lick her breasts and she decks him.  He's lying on the floor moaning, "Jeez lady....why do you let the bartender do it?"

"Duh", says the blonde, "He has a licker license!"