In this article, the postmodern ontological approach based on McHale's theory in the novel of lovemaking is examined in a descriptive-analytical manner. Brian McHale sees postmodernism as a continuation of modernism. According to him, the dominant thing in modern fiction is epistemology and in postmodern fiction is ontology. This research shows that the romance novel reveals more about the possible worlds in the story and, according to McHale's theory, has a more prominent ontological dimension. In the study of this novel, the interaction between your worlds in "reality" and "fantasy" is shown and using McHill's theory, while exploring the unrecognizability of imagination from reality, the influence and obedience of reality to fantasy On display. By creating inner stories and overlapping narrative levels when Baharloo pits different worlds against each other or when he breaks the boundaries between them with fictional tricks, in fact, the considerations of existence. It evokes cognition.