guys have to
there's even an article in cosmo about it. a wife wrote in asking about it. i was so proud - i shoved it in my wife's face.
2 things - men have a buildup of testostorone and need a release, or flat out you will be affected negatively some how. the article had a doctor explaining how men need a release at least 3 times a week, sometimes more.
apparantly, its also good for your heart.
on the lighter side - when you whack off, you can imagine everything, even the taboo stuff. its fun and its always an orgasm..