first of all, why 2 gf's? and they don't know about eachother? sigh...
secondly, i was under the impression that the "taste" actually has more to do with your diet than your emotions. if it is emotioanlly related this would be the first i've heard of it - not saying it's not possible, but i'd check your diet first. do you eat differently depending on your schedule?
another thing, you said that each gf says something - but they each say it at DIFFERENT times... how about asking what they think about your taste at the SAME time? it could be that they just have different taste buds and one of them simply does not like the taste of cum - like many women. people really do taste a lot of things differently.