Guys- drink pinapple juice, it tastes much better. But don't think that any old juice will do the trick - Lemonade, yuck!!
Girls- I've heard the same thing if we drink Vanilla soy milk. Just to be nice to our guys.
What you consume will flavor what comes out of you, so if you are on a date expecting something later, stay away from the spicey and sour stuff if at all possible.