Peter and Lois visit a marriage counselor, and Peter gets help pleasing his wife orally via hypnotherapy and trigger phrase.
This clip reminds me of a radio spot Bally's Casino had some years ago. In it, a wife hypnotizes her husband to get him to take her to Bally's. One of the posthypnotic suggestions she gave him was, "Every time I say the word "Bally's" you will quack like a duck." After awakening him, she tests his trigger response several times. When her husband realizes what she's done to him, he pleads with her to make it stop. Then she laughs at him and uses his trigger several more times. The more he responds to her hypnotic programming, the more amused she becomes.