A young man wasn't very good at getting women, so he asked his very well endowed friend (who always had women hanging on his arm) what to do to get a girlfriend. His friend told him to buy some Speedo underwear and put a sweet potato in it and that will make the women come chasing after him.

The next day the young man comes running up and tells his friend the women are screaming and running AWAY from him. His friend looks at him and says "You put the sweet potato in the front, not the back."