Although it's pretty common place, I always do extreme wiping down of toilet seats if I have to shit in a public restroom.
I first thoroughly wipe it down several times over, and then place multiple layers of TP on top of the seat all the way around so my penis and ass don't touch the infested bowl.

I'm glad you shared this with the class, nameless. What i do, is checking paranoidly and multiple times that no one else is in the bathrooms (that is on the university) for i hate shitting with an audience. Even if thats someone else just minding their business...

Sometimes when I go to the store I plan my route in advance so I can grab everything I need in a single motion and make it to the checkstand without ever stopping