I think, like others here, that it depends on the individual. I apologize more often than my husband, even when I feel I was right. I dislike the tension our arguments create, and I can get mean during arguments sometimes.
Rich has a hard time apologizing, but I don't have to hear I'm sorry to realize he feels it. He generally does something kind, like take the kids and give me a break, or make me tea or something kind. His actions tell me he's sorry.