Stamp Collecting Straight Man: The Promiscuous Couple, known in Chinese as 集郵直男之淫亂情侶, is a captivating web novel that delves into the themes of ecchi, romance, smut, and yaoi. The story follows the adventures of a promiscuous couple through modern-day scenarios filled with taboo relationships and sensual encounters. Packed with R-18 content, the novel explores themes of incest, threesomes, and more, making it a must-read for fans of steamy and unconventional romance novels.