the dye yellow #5 slightly decreases your sperm count apparently, not enough to notice im sure and uhhh even if that would be sick cause it lowers your risk of getting a girl preggs.
it actually makes your balls swell and increases your sperm count. but girls tell you the opposite. because when you bust a HUUUUGE load all over their face they be like "damn he was drinking mountain dew again"
neither yellow #5 nor any other ingredient in mountain dew causes anything to happen to your reproductive system. they is all urban legends. if it did in fact do this, I am sure the FDA would have figured it out long ago, or at least before middle schoolers figured it out
it lowers your sperm count a bit, but i think your in good shape. One guy if the sperm was perfectly placed could make every chick in the U.S. pregnant.... you got a lot of little buddies swimmin in your pond man.