You're expected to help your spouse with household chores.
Fred is coming home exhausted from a stressful day at work and his wife was too busy with the kids to do the dishes.
Fred wants to rest when he gets home.
Fred takes a short nap when he gets home then does the dishes after.
Fred turns in early for the night when he gets home.
Fred's wife has more energy and time to take care of the kids the following day.
The chores pile up and Fred's wife has even more to do the next day.