It really depends on the individuals and what the argument was about.
Some people are really great at recognizing they lost their temper over something that really had nothing to do with their mate.
It may have been due to something that happened at work or whatever and they ending up taking it out on their spouse over the slightest of things. These types of people usually don't have a problem apologizing soon after.
I suspect it's very rare that a couple "laughs" about a fight within the immediate future. Maybe several months or years later they might find themselves retelling the story to friends and laughing about it then.
People oftentimes talk about how great "makeup sex" is after a fight. However I'm one of those people who if angered sex is the last thing on my mind. This is especially true if there were some hurtful things expressed.
Anger is the Mask that Hurt wears....
I suspect after most fights there is a cooling off period where couples kind of keep their distance from each other within the house. Eventually someone "breaks the ice" by talking about something unrelated.
In other instances friends/family drop by or children enter into the room.
Essentially that fight is now dead and they just move on without talking about it again. They may harbor some resentment but it eventually fades. Nevertheless neither party "forgets" the hurtful things that were said. The more frequent the arguments occur someone is likely to reach the conclusion they're simply incompatible and look to walk out. Unless you talk it out you never know what the other person is contemplating.
Communication is the GPS for relationships.
It lets you know if you're "growing together" or "growing apart".
"Spiteful words can hurt your feelings but silence breaks your heart." - C.S. Lewis