A Koala walks into a bar...

So he sits down and after a while of chatting with the barkeep he starts to notice a girl eyeing him from across the bar. So he goes and talks to her and after some flirting they decide to go upstairs

So they go upstairs and get into the 69 position and when its all said and done the koala goes to leave, but the girl says "Hey, where's my money?" Appalled he says "What do you mean?" She replies by telling him to look up the definition of prostitute in the dictionary. He does so and it reads 'One who does sexual acts for money.' He then tells her to look up the definition of koala in the dictionary. She does this and it reads "small, tree dwelling marsupial that eats bush and leaves."