Free Sex With Fill-up

A gas station owner in Tennessee was trying to increase his sales. So he put up a sign that read, 'FREE SEX WITH FILL-UP.'

Soon a local redneck pulled in, filled his tank and asked for his free sex. The owner told him to pick a number from one to ten If he guessed correctly he would get his free sex. The redneck guessed eight, and the proprietor said, “You were close. The number was seven. Sorry. No sex this time.”
A week later, the same redneck, along with a buddy, Bubba, pulled in for another fill-up. Again he asked for his free sex. The proprietor again gave him the same story and asked him to guess the correct number. The redneck guessed two this time. The proprietor said, “Sorry, it was three. You were close but no free sex this time.”
As they were driving a way, the redneck said to his buddy, “I think that game is rigged and he doesn't really give away free sex.”
Bubba replied, “No it ain't, Billy Ray. It ain't rigged. My wife won twice last week...”