Emotional robots, as a new research hotspot in the field of intelligent robotics research, can interact with human beings in the field of life services, social management, etc., and begin to become confidants, companions, and even family members. From the perspective of emotional interaction, this paper explains that couple robots bring the Valley of Horror effect to human culture, and also relieve social phobia and loneliness, and assist the development of human civilization, but conflict with the traditional concept of marriage and monogamy. The main issues regarding the use and ethics of couple robots are the algorithmic vortex of intimacy, the privacy leakage of emotional relationship data, the paradox of virtual and real emotional relationships, and the aversion to real intimacy. It is proposed that theoretical propositions such as positive psychology and positive technology should be fully utilized to prevent and avoid the ethical risks that may arise from couple robots by making them artificial moral actors, delineating the bottom line of research and development and application, promoting the development and advancement of ethical norms, and establishing an all-encompassing risk prevention system.