This desperate guy named Jim goes to the whorehouse with 5$. He buys a the cheapest prostitute named Sandpaper Sally.
As they start to have sex, Jim screams, "Ouch! Now I know why they call you Sandpaper Sally!"
Sally scoots out of the room. Five minutes later she came back and Jim attempts sex once again.
"What the hell happened?" asks Jim, "This is the best sex I''ve ever had!"
Sally replies, "Oh, I just picked my scabs."