Like has been mentioned - pelvic floor physio. By doing their prescribed exercises you can fix the problem, but it takes a while and dedication/discipline which many don't follow through with. You have to retrain several interacting muscle groups that are out of whack from an extended period of 'taking over' movements that are supposed to be covered by different muscles.

That being said, there are other more serious problems that have the same symptoms so don't use this to "explain it away" instead of talking directly to a urologist about it. This all applies to women as well.