Free sex with fill-up

These two business men were driving home across the desert.. and they were in need of some fuel.

They pass a sign that says, "Free sex with fill-up"

"Hey man" says one business man, "I've heard of that. Let's try it."

So they stop...

"Can I help you?"

"Yeah, fill 'er up"

(a few minutes later)

"That'll be $18.50 please"

"Hey, wait a minute, your sign says free sex with fill-up"

"Oh, why yes it does, but it is conditional.. I am thinking of a number between one and twenty, what is it?"

First business man: "Five"

Second business man: "Eight"

"No, I am sorry gentlemen, it was two, well, better luck next time"

The two business men leave and are a bit perturbed...

"Aw man, we were ripped off!"

"Nah, I don't think so, last week my wife went in there twice and won both times!!"

Free sex with fill-up - Some guys looking for a quickie with their gas.