Lots of great answers here already about the marriage part. I’m going to say something really unpopular in today’s society about things men need. Men need a non-verbal outlet for their anger and frustration. Even cerebral men will not successfully purge all of that negativity just by talking. That outlet can be weightlifting, running, hiking, boxing, or any number of things. Without that outlet that bitterness builds endlessly. Fight Club does a great job of showing the despair that comes from not having a physical outlet for those emotions. Or maybe not all men need that, but I know I do, as do all of my male friends. Obviously we can’t say if that has any bearing on your coworker’s situation, but you asked about needs that aren’t fulfilled by marriage alone, and that’s one that I’m aware of.