According to a British couple, Harry and Floss Lucas, who have been married for over 70 years, the secret to a happy marriage is to argue every day.

(The bickering pensioners claim they have notched up around 25,550 quarrels since they got married in October 1942., but they also say they always kiss and make up before they go to bed.  I don’t think this would work for me as I hate confrontation.)