I usually fold it then wad it slightly, of course this does depend on the episode. Like Andy said earlier, if the diet is healthy then a fold is good, but if was a chilli night then I bet fold then wad.
About the bidet, badday, or whatever you wanna call it. Being in Japan, most places have these or a similar type. I call them ass crack washers, it is part of the seat. I will miss my Japanese toilets more than most things when I leave here. Heated seat, warm water ass cleaner, and hell some even have a fan to blow you dry. I have considered buying some of these before I leave to install on my toilets. Two things keep me from doing this...they are like 500-700 bucks a pop and most American bathrooms do not have electricity behind the toilets, so there is more money to run power there.
Man all this talk about....ooohhh gotta go.