We butt heads. We're too much alike. We both are take-charge kind of people.
To surmount this marital obstacle, we usually delegate projects and only work on things jointly that are simply impossible to do alone. However, after almost 12 years of marriage, we may have finally conquered our territorial leanings.
We repaired the duct work in our attic.....ourselves....together...without a single argument....with nary a bad mood.
We have either evolved, or simply gotten too old to care about fighting.