Ever wonder why the bathrooms smell so bad?

I bet you can guess, but there's something I noticed while I was in Puerto Rico, and again here in Mexico. 'Course, my sample size is a bit limited, but at both offices, the bathrooms had a distinctly stronger smell than usual. I've taken a photo to show why:
Thats right, there's a garbage can next to the toilet. You don't put normal garbage in there though, no, that would be too obvious. Instead of letting the used toilet paper fall where used toilet paper belongs, you put it in the bin off to the side.

So now you know, and knowing is half the battle.