A prostitute walks into a bar. She spots a koala bear sitting at the end of the bar. After a little small-talk and flirting, the koala bear goes home with her. They frolic all night long. The next morning, the koala gets up and wanders towards the door.

"HEY! Where are you going?" yells the prostitute. "I haven`t been paid!"

Realizing that he is a koala bear and might not understand, she reaches for a dictionary and looks up "prostitute".

She shows him the definition:

PROSTITUTE (pros`ti toot) n. A woman who performs services for money.

The koala bear looks at her and then grabs the dictionary. He shows her a definition:

KOALA BEAR (ko all e Bare) n. A furry marsupial. Eats bush and leaves.