You need to tell him what you feel and how he is depriving you of the most crucial part of a healthy couples life...intimacy. Sit down with him and ask him what he has to say after you tell him that you feel angry and betrayed by him having sex with the full size sex doll. Ask him why he prefers the doll over intimacy with you. There could be potential reasons, such as: stress, anxiety, or performance issues. Your relationship lacks of emotional or physical connection. Or he has curiosity and a preference for fantasy over reality.