Kotteri Okusan: Otto no Otôto mo Kuwaete (2004)

Hideharu and his wife Lisa are trying to conceive a child. One day, Hideharu receives a call from his mother; she wants him to contact his twin brother, Haruo, who isn't answering his phone. Meanwhile, Haruo—a playboy and the polar opposite of Hideharu— is on his way to a hotel with a woman named Mrs. Nishida, whom he had met through a telephone dating service. Their relationship is based solely on the pursuit of pleasure, and they enjoyed engaging in kinky sexual acts...