Best joke about prostitution ever done was by Bernard Shaw.
He was at a party once and he told this woman that everyone would agree to do anything for money, if the price was high enough.
`Surely not, she said.'
`Oh yes,' he said.
`Well, I wouldn't,' she said. `
Oh yes you would,' he said. `For instance,' he said, `would you sleep with me for... for a million bucks?'
`Well,' she said, `maybe for a million I would, yes.'
`Would you do it for ten bucks?' said Bernard Shaw.
`Certainly not!' said the woman `What do you take me for? A prostitute?'
`We've established that already,' said Bernard Shaw. `We're just trying to fix your price now!' "