The Major Battle Between the Sexes
Should the toilet seat be left up or down? Of course, it's not really about a seat, it's about control. The toilet seat is one area where some women can feel in control over their mates, and, however unreasonable, insist on having their way. A guy walks in the bathroom and raises or lowers the seat as needed, without saying a word about it or making it an issue.
The solution is so simple: Install urinals in the home. A urinal allows a man to pee standing up and both genders use the toilet for sitting - the lid stays down.
I installed urinals in the home office in 2000 and in the house in 2004. In 2007, I replaced those with waterfree urinals. These use a gel filter to trap odors while allowing liquids to pass through. There is no more flushing - saving gallons of water annually.
Below: The original 2004 urinal in my house. Waterless model installed in 2007.

Better urinal placement

Proper piss etiquette was probably established when two cavemen went to the same tree to pee. The etiquette is that the two men are to stand as far away from each other as is plumbingly possible. That means if there are 3 urinals, its absolutely mandatory that two men use the outer two urinals. But, too many architects put the child's size on the outside, forcing the second man to decide whether to stand at the adult urinal next to the first man (inappropriate) or pee into the child's urinal and risk wetting the wall (unsanitary). A simple solution is shown in the images below - install the child version in the middle. The child may feel self-conscious but how often have you seen a kid standing at the urinal? Please tell all the architects you know to design public restrooms in this format starting tomorrow morning (or by the weekend, at the latest). Men everywhere will thank you.

Now this is just rude and inconsiderate. The architect here designed a generous stall area to move the two men farther apart (good etiquette) but had one urinal installed too close to the other one (bad etiquette). There is even wasted space between the stall and the sink counter. Both urinals could have had generous standing area.

This may be the most famous urinal in history

This scandalous work was a porcelain urinal, which was signed R.Mutt and titled Fountain.
Submitted for the exhibition of the Society of Independent Artists, New York City, in 1917 by Marcel Duchamp, Fountain was rejected by the committee, even though the rules stated that all works would be accepted from artists who paid the fee. The piece was later displayed and photographed at Alfred Stieglitz's studio, but the original has been lost. The work is regarded by some art historians as a major landmark in 20th-century art. Replicas commissioned by Duchamp in the 1960s are now on display in a number of different museums, like in MoMA, above.

This bathroom is in the New Museum in the Lower East Side of Manhattan. So beautiful that the bathroom is even named after the donors. I hope that's the reason - maybe this is their private restroom and I shouldn't have been in there.

What a great idea for homes without urinals - this allows the guy to raise the seat with his foot and not have to touch the seat with the hand. Saw this in the restroom at IKEA.