A koala bear and a hooker

A koala bear and a hooker go back to her place and they get undressed.
The koala bear goes down on the hooker....for 3 hours straight. She has
multiple orgasms. After three hours he stops, gets up and puts on his clothes.
The woman is hanging back huffing and puffing from exhaustion.
"Oh God, that was great! Now I need my money."
The koala bear just looks at her and shrugs.
Then the hooker says,
"No, I need my money. I'm a hooker and this is how I make my living."
The koala bear just looks at her and continues to put his clothes on.
Then the hooker gets up and runs to the bookshelf and grabs a dictionary
and thumbs it to "hooker", She hands it to the koala bear and it reads:
HOOKER: person who has sex for money.
Then the koala turns the page to "koala bear" and walks out the door.
The hooker reads: KOALA BEAR: eats bushes and leaves.