Housework was a woman's job, but one evening, Jenny arrived
home from work to find the children bathed, one load of laundry in
the washer and another in the dryer. Dinner was on the stove, and the
table set. She was astonished!It turns out that Ralph had read an  
article that said, 'Wives who work full-time and had to do their own
housework were too tired to have sex'.

The night went very well. The next day, she told her office
friends all about it. 'We had a great dinner. Ralph even cleaned up
the kitchen. He helped the kids do their homework, folded all the  
laundry and put it away. I really enjoyed the evening.'

'But what about afterward?' asked her friends.

'Oh, that ..., Ralph was too tired..'