Mary was married to a male chauvinist. They both worked full time, but he never did anything around the house and certainly not any housework. That, he declared, was woman's work!
But one evening Mary arrived home from work to find the children bathed, a load of wash in the washing machine and another in the dryer, dinner on the stove and a beautifully set table, complete with flowers. She was astonished, and she immediately wanted to know what was going on.
It turned out that Charley, her husband, had read a magazine article that suggested working wives would be more romantically inclined if they weren't so tired from having to do all the housework, in addition to holding down a full-time job.
The next day, she couldn't wait to tell her girlfriends at the office. "How did it work out?" they asked.
Mary said. "Charley even cleaned up, helped the kids with their homework, folded the laundry and put everything away. I really enjoyed my evening."
"But what about afterward?" her friends wanted to know.
"It didn't work out," Mary said. "Charley was too tired."
(FWIW, my wife thought this was really funny...)