This is actually the title of a book that you're supposed to read before you get married, but here's a list that, if followed, will help to prevent any self-help books from happening. If used correctly, it may also prevent over-analysis of relationships, the silent treatment, and may lead to more cuddling and quality time, and football, and other good things.
That said... Avoid the following situations, or proceed with due caution.
9 Simple Things That Will Cause Fights In Any Relationship
1. Directions, or lack there of
3. Neglecting the 10 minute post-work decompression time
6. Board games
7. Picture hanging
9. The trash
You have been warned.
Thanks to Heather for her contributions to this project.
Update 11/17 12:12am - Thanks to Josh and Eric. Josh, flatulence shouldn't cause fights, if both parties are open and honest and accepting. I'll give you insecurity, however, even though it's a bit general. Eric, I'll give you trash.