The quote is by the main character, Changez, as he is relating his life's story to an American visiting in Pakistan. Changez had just finished telling the American about a picnic that he had with his friend Erica in Central Park. He had loved this woman for a long time; in fact, ever since they had gone a trip to Greece with friends. So the first initial touch of skin on skin was quite a memorable moment for Changez as he falls deeper in love with an American girl. Another aspect of the comparison that he makes with the skin being alike is to make the point that he is just as human as any other American. After 9/11, Pakistanis were enemies and practically demonized in America's mind. Here, he points out that he is just a regular guy in love with a regular girl so that he can have sympathy from the American to whom he speaks.