Lube on thermometer or bumhole

Always on and INSIDE anus

It depends: If the thermometer—and I’m talking specifically about Geratherm glass thermometers here—is going to stay inside the sphincter for a little longer without me having to hold it in place, then no lubricant is needed. Otherwise, for the pleasure of both the giver and the receiver, the anus is always carefully prepared with Vaseline; that’s an integral part of the entire procedure.

I usually received a lubricated thermometer. Very rarely was the anus lubricated beforehand with a finger.

As younger kid I can only remember the thermometer was lubed, but through my teen years my anus was too.