Granted, I don't drink coffee, but I was under the assumption that if it wasn't too hot, then it wasn't hot enough. That's gonna be some lukewarm coffee by the time you get to the bottom of the cup. I like the idea of not putting a cup of coffee near my genitals.
The old bus center where I used to catch my busses to school and work had a coffee/hot chocolate machine. I'd buy hot chocolate and man, that stuff was scalding. After a couple of minutes, it was drinkable and just hot enough.