Racing car driver
A man goes to the doctor and says, " Doc, you've got to help me with my sex life. My wife thinks she's a racing car driver, when we're in bed her hand comes over, grabs hold of my John Thomas she rams it forward for first gear, back for second across and down for third and back again for forth, she even tries pushing my helmet in to get reverse, look at the state of it". The doctor says, " The next time you feel her hand coming, roll her over and give her a large portion from the rear". That night their laying in bed and as his wife's hand comes over he rolls her over and whips it in, with that she lifts her head and says " 5 gallons please".