What is a kegel exercise for men?

Exercises to work. Out the pelvic floor muscles. You can basically perform a Kegel by starting to urinate and then stopping the stream abruptly. Another way to think about it is trying to create the "opposite" sensation of when you are trying to poop ... pull instead of push! Benefits wise, for men it may help with fecal or urinary incontinence, and possible some element of erectile dysfunction.
Same as for women. Men and women have the same muscles in the perineal area that serve the same functions. Kegel exercises help strengthen the pelvic floor muscles and help improve incontinence. The exercises may also help improve sexual function.