I typically don’t use these butt protectors because well… they’re a pain in the butt! They tear easily when taken from the packaging, especially when you rip the little tabs on each side that hold the middle part together. The irony is that the middle part is completely unnecessary anyway. That said, I try to practice good hygiene and I’ve tried to employ these fortresses of personal protection but with varying results.
One time, in a sketchy public bathroom, I pulled one from the packaging and laid it down on the seat and due to the angle of the seat (it was banked like a tight NASCAR oval) the “gasket” slipped right into the water. On my second attempt I tried to sit down super fast to try to pin the butt protectant sealing ring thing-a-ma-jigger to the seat with my derriere faster than it could slip into the water but to no avail. Then I got smart… I dabbed a little water on each side so it would stick to the toilet seat. That worked although it seems to have defeated the purpose.
If the toilet seat is too dirty to sit on these porous paper barriers don’t seem like they would do much anyway.