Advance Payment
A man picks up a prostitute and back at her place he gives her $1000 before they start.
"Oooh!" she says "For that you can have as long as you like".
The man then takes off all his clothes and chucks them in the lavatory pan and then pulls the chain.
"Why on earth have you done that?" asks the prostitute.
"Don't need 'em any more" says the man "By the time I'm finished with you they'll be out of fashion!"