I once heard an actor being interviewed on late-night television. "Tell me," said David Letterman. "You're a sex symbol who plays all sorts of exciting roles with gorgeous women. How does that compare to your real life, off-screen?"

The actor reminded Letterman that he had been happily married for 20 years. Then he said, "Here's the difference in a nutshell. In the movies, life is mostly about sex and occasionally about children. Married life is mostly about children and occasionally about sex."