Lol! You don't have to lick the soap. Just wet a finger rub it on the soap and then touch your tongue with the finger. Zap testing is very accurate and unmistakeable. If you think you may have been zapped - you have not! You will not have to question zap. It does not hurt, but is an uncomfortable sensation, not a taste. If you get a zingy taste it is the EO / FO , not zap.