Toilet Seat: Put Up Or Down?

I am wondering, is the toilet seat supposed to be put down or put up after use? Should the seat cover to be down as well?

From a girl's point of view, the seat should be put down. Normally, it is just going in, cleaning it and then doing "business". This should leave the seat clean. Though it looks clean, it is still more hygienic to clean it thoroughly again.

But from a guy's point of view, it should be put up. You will be surprised that there are dumbos out there, either they acted dumb or just pure lazy, who thought it is OK to do their business with the toilet seat still down. This happened in my office, and the worst thing is that they don't even try to clean after staining it.

Therefore, there should be a campaign to educate people on this toilet etiquette, and this campaign must be visually clear. We should pity those who needs to use toilet seat at all times. Don't expect all our public toilets have tissue paper to wipe it clean, or force people to squat on the toilet bowl.