LK: Do you think there should be ground rules for marital fights?

JS: The best piece of advice I received before I got married was, "Be careful what you say when you're in a fight, because it could stick in someone's head." I don't think I've ever said anything I really regretted. I'm very sympathetic to women. I've really studied wife-ology, and I know you've got to figure out the feelings. Deal with the feelings.

LK: So what's your fighting style?

JS: I can get very lawyerly when my wife and I get into a thing. I get very logical and I try and channel my emotion through that.

LK: Well, that's one approach.

JS: If you're a man, you have to figure out what she needs to hear. So ask her: "What do you need to hear me say?" And then just say it. That's a very good way out of an argument. But then you have to act—you have to say it like you mean it. Even our kids have this thing where, if you say, "I'm sorry," they go, "No, say a nice sorry. If it's not a nice sorry, it doesn't count."

LK: Any other ground rules?

JS: I'm very big on staying in the room. In fact, I said this to my wife the other day: "I understand that you're so upset that you just want to walk away. But, you know, I don't care that it's hard." You stay in the room until you feel better. Then you can leave.

LK: How about the classic, "Don't go to bed angry"?

JS: I remember agreeing to that on the night of our wedding. I don't think we've kept it once.

LK: So monogamy—is it natural? Something we ought to aspire to?

JS: My personal viewpoint is this: The problem with humans is our heads are just way too big. And one of the greatest appeals of monogamy is the simplification of the mental process. I don't have any friends who aren't faithful to their wives, but if I did, my main question would be, "Who's got time to figure all that out?" It's just too much work. The emotions that have to be disposed of, the values, the ethics.... All I see is this gigantic amount of work for a fleeting pleasure. People should get married because they have finally seen the folly of being single: "Oh, this is all just kind of a bad magic trick. I just keep bending over to reach for this wallet on a string. How much longer am I gonna do that?"

LK: What's one of the things you most like about being married?

JS: I love being made fun of, if it's done well. I love being brought down to size.

LK: And your wife is good at that?

JS: Yes. Yes. Yes, she is. I feel like humor is the answer to everything. For example, let's look at David Letterman and Tiger Woods. Now, there are some differences to the two situations. The biggest difference is, what can a guy who has humor do that a guy who does not have humor cannot do? You're looking at a guy who knows how to make fun of himself, and a guy who hasn't the first clue how to make fun of himself—and the resulting difficulty. If you have a little bit of humor in the shaker and you can sprinkle that on, that's your answer.

LK: So ultimately, is marriage worth it? Or is it the most foolhardy thing we could do?

JS: No more foolhardy than "I think I'll take human form for 75 years and try to negotiate the planet I see below me." There's a tremendous power and energy in sharing your life with another person. I'm married ten years next week, and it's as big a joy for me now as it was when we first started dating. I love these two puzzle pieces that don't quite fit, you know? Somehow you make them fit.

More Seinfeld: Read Oprah's interview with Jerry

More from the O relationship vault: When to speak up—and when to shut up