Funny Racial Joke

An American guy goes to Pakistan to get laid. He takes a girl from the street back to his hotel room. After the first round he asks her, "You finish?" She shakes her no.
They go for a second time and again he asks her, "You finish?" But again she shakes her head.
They do it a third time and he is exhausted at this point. He asks her, "You finish?"
She replies, "No, I'm Pakistani."