An Australian hooker goes into a tavern, empty, except for a lone Koala bear sitting at the bar.

An Australian hooker goes into a tavern, empty, except for a lone Koala bear
sitting at the bar. She walks up and asks if he would like to spend the night
with her. He agrees and they both go back to her place. On the way, she asks
if Koala bears are really as good with their tongues as rumor says. He
replies that they are indeed. They make love all night long, and in the
morning, the Koala thanks her and turns to go. "Just a minute buddy, that'll
be 100 bucks." she says. "Koalas never pay", he explains calmly. "I'm a
prostitute, I make my living this way, you owe me 100 dollars!" she says, but
his reply is the same; "Koalas never pay". Finally, in desperation, she gets
a dictionary from the shelf, looks up "prostitute", and shows him: "See?
prostitute: One who takes payment for sexual favors." The Koala takes the
book flips to the Ks: "koala: Australian marsupial, eats bushes and leaves"