Man and his date are driving out of town and into the country, they get to

a secluded lane and park. Things start hotting up when the woman stops him and says: "I have to confess I'm really a prostitute and it'll cost you $20.....".

By now the man is really hot so he hands over the cash and they carry on their business. After they have finished, he lights a cigarette and just sits there.

The woman looks at him and says:" What's the matter, why aren't we moving?".

To which the man says: "I have to confess I'm really a cabbie and it'll cost you $25 to get back into town...".