“约泡”(yuepao) means making love with the people who are not their legal spouse or not having normal relationship. Usually, they know each other via the Internet or other ways, even some are strangers for each other. They make an appointment to meet each other just to satisfy their physiological needs. After having sex, they just leave as they haven't seen each other before. They don't need to be responsible for anything. But, they also can “约泡”(yuepao) again without having any feelings.