People
Some people ask the secret of our long marriage, We take time to go to a restaurant two times a week. A little candlelight dinner, soft music and dancing. She goes Tuesdays, I go Fridays.
— Henny Youngman

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The setup sounds like sweet marriage advice, with dinner, music, and dancing. Then the punchline flips it: the couple goes on different nights. The joke plays on the idea that a long marriage survives partly through generous amounts of time apart.
Context reviewed