Strange Bedfellows (1965)

They love to fight... but not at night!

After a hasty wedding, Carter and Toni find that they disagree on everything. They separate and seven years later, on the eve before their divorce, meet again and spend the night together. Reality sets in when morning comes and they begin arguing again. Once again, divorce proceedings are on — until Carter finds out that an important promotion hinges on whether he's married.