I certainly don't disagree that shocking a frog is bad for their health. Potentially fatal. Recommending water at 90 is under the assumption that people keep their tank between 80 and 85. So it's really not that big of a jump. And like pluke said, and I mentioned earlier lukewarm is highly debatable. It depends on peoples judgment and even hand sensitivity. Baring in mind 99% of people won't test the temperature of the water before a bath, most people are probably using 90 degree water and not even knowing it.