So this lady goes to her doctor and explains that her husband can't get it up like he used to and their sex life is suffering. The doctor asks, "Have you heard of a new drug named Zyban?" The lady says yes, but adds that her husband refuses to take pills of any kind, and certainly won't take anything that "will make him feel like less of a man." The doctor advises the woman to slip it into his morning coffee when he isn't looking. The woman is nervous, but the doctor insists, "it will change your life within a day," so she figures she'd better try it.

A week goes by and the lady shows back up at the doctor's office and the doctor asks her how it went. The lady heaves a tremendous sigh and explains, "I slipped it into his coffee like you said. And, sure enough, within 15 minutes, he cleared off the table, threw me on it and we had the best sex we'd had in 20 years." Perplexed, the doctor asks, "What's wrong with that?" And the lady shakes her head and says, "I don't think i'll be able to show my face at McDonald's again."