...may depend on whether or not the conversation / argument / discussion is taking place in public or in the privacy of their home.
Went to a beautiful wedding this weekend--lots to eat and drink, familiar faces all around, danced til my feet hurt, and of course, lots of great speeches and tributes (was a West Indian wedding). After paying touching tributes to her mother and other family members and friends, the bride gave her new husband the mike declaring--much to our amusement--he is the one who will have the final word.
I can't speak for the other married folk who were amused, but I know what is said in public is not always the case in private when it comes to the business of marriage. I've seen cases where the meekest of wives who shyly and respectfully (some may say) defer to their husbands in public actually rule with iron thumbs at home.
I don't know what kind of wife she'll be, but I'd bet he won't be getting the last word too many more times. Equality in marriage may manifest itself in several ways--she has her chores, he has his, they both work outside the home, e.t.c.--but one spouse is usually the decision-maker, and more often than not, it's the wife.
Now don't go getting all anti-marriage and nuts you single men. Take a good look at the men whose wives make most of the decisions in their relationships. Don't those men look happy, well taken care of, fat, and content? Now come on, you know that's how you'd like to look when you get married. Don't you?