I'm rather fastidious over toilet-related stuff. I use public toilets only if I'm totally desperate and thanks God this is a very very very rare event. I use the toilet in my office because it would not be possible to do otherwise being at office about 10 hrs a day, but you bet I don't seat (buttocks-seat contact) nor do I put covers on the seat. I just avoid any contact and do what I need to do as fast as I can. It's all in the thigh muscles, I guess!