Article on toilet seat economics.
Abstract: This paper develops an economic analysis of the toilet seat etiquette. I investigate whether there is any efficiency justification for the presumption that men should leave the toilet seat down after use. I find that the down rule is inefficient unless there is a large asymmetry in the inconvenience costs of shifting the position of the toilet seat across genders. I show that the selfish or the status quo rule that leaves the toilet seat in the position used dominates the down rule in a wide range of parameter spaces including the case where the inconvenience costs are the same.
Now, I wrote about this four years ago, so here is that info again. A different conclusion.
(Nod to RL and MA)