Folding KK Preflop?

This situation has come up a 3 times in the past few weeks and I have been on the wrong end twice. I have KK and raise standard 3x. Then a person to my left moves all in for a full buy in. Playing on Bovada I have no histories with these players. One time I call and im up against AA another time im up against QQ and lastly up against AK (which they flopped an ace). I've lost twice and won against the QQ. I realize I got it with the best hand against the AK. However I rarely like risking an entire buy in with only one pair. Does anybody have any info on how to deal with this situation? Anybody always calling no matter what? Any reason to fold? I will obviously be using my best judgment while up against a certain player and their style. But like I said this becomes difficult when on Bovada where it is anonymous. Any feedback would great.

I do not think you'll find a man who threw pair of KK preflop even if u know your oponent have Aces...

I would never fold a KK preflop, maybe just maybe against a super nit who shove to mu 4 bet when i absolutely sure that he have aces but i cant recall that situation, now whit the anonymity thing on bovada and a 3 bet shove instead of standard 3 bet i would always call, i would be happy that every time i have KK i went to preflop allin, im not saying shove and chase away everyone, call a shove or shove when you are absolutely sure that you'll get called. this is a +ev longterm imo

So twice you got it in good and one time they had aces, it is obvious what the profitable answer is.

Force call for me. You cant do anything if he has AA. Thats poker. But going all in for KK with one player opponent is profitable in the long run. But if the situation is someone bets and you have KK and youre afraid to go all in, then you can call and see if A appears on the flop. You can now decide what to do next.
Goodluck.

have to play with KK, I would not know exactly how many times you would lose with KK, AA out but where we also think they are more often than you earn. that day I touch you lose.