A couple is having problems with their sex life so they decide that they are going to get some medical advice. They go to a doctor one day and tell him their concerns. The doc takes each one of them onto a separate room and gives them each an examination. He then takes them both into a room together and sits them down for a talk. "I can help you, " says the doc. "all you need to do is go to the store and buy some grapes and some doughnuts. When you get home with the groceries, get naked, sit on opposite sides of the room and play a little game. Miss, you try and loop the donuts onto your man's erection, and sir, you try and shoot hoops, (so to speak) with her v." the couple goes home and tries it and has the best sex they have ever imagined.
A couple weeks later the girl is telling one of her friends about the doctor visit and her newly found sex life. The friend decides to take her man to the doctor with her to see if their sex life can be improved as well.. so same thing... doc takes them in separate rooms, examines them, and then sits them down in a room together. "I can't help you." the doctor tells them.
"But you helped my friend," the lady responds.
"You have to be able to help!"
"well," says the doc. "go to the store and buy some apples and some cheerios."