The nine stories in Mary Gaitskill's first book, Bad behavior, are all about people longing for connection with another human being, and the messed up ways they go about trying to create that connection. The people in these stories are gritty and real; these tales are at the same time depressing, inspiring, cautionary, entertaining, thought-provoking, and overall, quite compelling. I have the author's other three books checked out. Rated R for adult content (drug use, sexual situations, realism).
Note: the movie Secretaryis (very loosely) based on the story of the same name in this book.