A frigid and fastidious wife struggles with dissatisfaction in her sex life with her husband. Seeking to repair their relationship, she consults a psychological counselor. The counselor proposes a "sensory evaluation," introducing her to the pleasure of anal sex. Awakening to this new sensation, the wife begins masturbating by inserting vegetables into both her vagina and anus. As her husband and the counselor grow aroused by her pursuit of pleasure, they stimulate both her holes simultaneously, immersing her in deeper ecstasy. Realizing the allure of anal sex, the wife becomes addicted to the sensation, forging a new and twisted relationship dynamic.