This article covers almost all reasons why couples argue. They are presented in the Guardian.

However there are big differences with individual couples on what is and what isn’t said.  Many couples argue over sex without even mentioning the word or discussing sexual issues. Instead, when they are frustrated about having too much or too little sex they complain about trivia such as what to eat for dinner or whether to clean the house now or later. 

Money is the number one topic of couples’ arguments with more than 70% of couples arguing regularly over that issue. The real reason for the argument is often about who’s values are more important and each needing to be respected by their partner.

Most arguments  can be resolved if both partners agree to listen and understand each other’s point of view. If the timing isn’t right, couples can alleviate the tension by agreeing to discuss at a more peaceful time.

Power Snuggles: Your Path to Vibrant and Lasting Love provides 2 page scenarios of 81 different couples conflicts with suggestions for resolving them.