If you goggle kegels for men, it will tell you to stop your pee stream as hmb12 mentioned. You don't need balls to perform them. Do 30 kegels every hour and also some squeeze and hold for as long as you can. It will help your stamina 10 fold and also allow you to contol ejaculating when you are about to.
If you would like to make it interesting , enjoyable and more constructive use a NJoy large or 2.0 while doing the kegels. The extra weight will be more constructive and the plug, enjoyment. Squeeze the NJ and it will pull up naturally. Hold it for extended length of time while going for long walks. Same as women holding in kegel balls. In their case they have to hold it in otherwise they will fall out.
If you put kegel balls in your anus, they will probably just stay there. Squeezing them might cause them to go up where you don't want them to. Then you might have to go to ER if you can't expel them.
Anyway doing kegels will make your wife and yourself happy.