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No, Mt. Dew or Vault will not reduce the size of your testicles, but I did read a report sometime ago that excessive consumption of beverages that contain some of the ingredients that Dew or Vault and others have in them, such as Brominated Vegetable oil, may have an affect on sperm production. However, I can't speak to the validity of these claims.

Just bear in mind that drinking too much of anything is not good for you, especially surgery sodas. Even if it doesn't shrink your balls or effect your sperm, it will rot your teeth out and make you fat. And once you weigh 300lbs and have no teeth, you wont be getting much action anyway, lol.