(1) Iram Katourian (Jack Lemmon) talking to his mistress Irene (Joanna Gleason) about his wife Millie (Talia Shire) in For Richer, For Poorer (1992): -- Irene: ' Iram, do you really think that your money has anything to do with Millie's sex drive? ' -- Iram: ' Oh, absolutely. You've heard the phrase: power is an aphrodisiac? That applies to marriage especially. See, a poor man has tremendous power over his wife. She needs him. Without his support, her, the kids... she humps the hell out of him. The richer a man is the less his wife is depending upon him, the less power he has over her and the less sexy he becomes to her. It's a law of nature.' -- Irene: ' Horniness equals dependence times poverty squared.'
(2) Barbara Stern (Caroline Aaron) to Clifford Stern (Woody Allen) in Crimes and Misdemeanors (1989): ' Once the sex goes it all goes.'
(3) Frank Slade (Al Pacino) to Charlie Simms (Chris O'Donnell) in Scent of a Woman (1993): ' The day we stop looking, Charlie, is the day we die.'