OK, that probably needs a little explanation for anyone who isn't Good Will Hunting. Choi's formula assumes first of all that the same toilet is being used by both males and females throughout the course of the day. If not, why the hell would you be having trouble with this?
Now, we're going to assume that if you're old enough to read this sentence, you know that both men and women need to sit to poop, but only women need to sit to do Number 1. That means that if you leave the seat up permanently, both men and women are inconvenienced, but if it's always down, only men are. So you might figure that it's best to just leave the seat down and the dudes can deal with it as needed, which is what the ladies have been saying all along.
Especially if they're so dumb that they regularly shit all over their white robe.
But Choi's conclusions are more complicated, even if he's already put more thought into this than anyone in history by two paragraphs ago. As it's estimated that we each defecate once per day and urinate seven times a day on average, what we need here are graphs. So many graphs.
There is no excuse for not using little poop icons on that graph.