Too tired?

Either one is not going to help:

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..'