The guys I speak to say that its like its all a big sport sometimes. Except the goal posts can get moved. Then other guys just get married because their friends do. Pretty sad state of affairs. Personally, I think people should get married if they are (near enough) perfect for each other. And expect to remain that way.
This is my belief, too. I'm only still not married because none of my past girlfriends ended up being the "right" one. But with my current girlfriend, I feel like marriage has finally become a very likely possibility. And it is for this very reason that I'm not rushing into it. I want to make sure we get married when the time is right. So it's not like, as a man, I'm not marrying because I don't want to. I'm just not marrying quite YET, lol.